Incredibly popular in movies and other media are fights where one good guy takes on several bad guys and wins. Not quite as popular, but still popular, is explaining how unrealistic this is. And, to be fair, it is unrealistic. But it’s not as unrealistic as the critics make it out to be. After all, the entire social order of the middle ages was built around the fact that one guy, if he’s big and strong and well trained and armored and well-armed, can take on several less well-armed, less well-trained men and beat them (almost) every time.

We have, of course, all seen the classic triumph of cool-over-realistic which is a single good guy taking on a mass of bad guys in a featureless room where at least the good guy is unarmed and the bad guys helpfully wait their turn to fight the good guy one-on-one and be immediately dispatched with a single punch, not even necessarily to a vulnerable spot. And yes, this is nonsense. It mostly exists in reference to previous things, where they’ve taken what was cool about a more realistic fight and turned it up to eleven. It’s the fight-choreography equivalent of someone falling out of a building and we see them at least five feet away before we cut to commercial and when we come back someone manages to grab their arm and save them. It’s unrealistic, but it was intentionally unrealistic as a means of being more-cool-than-real. It’s cheating, basically. But this exaggeration no more means that every one-on-several fight is unrealistic than the exaggeration about falling means that people can’t stay on buildings.

An interesting example of this is from the movie Reacher:

When the head tough says that it’s five against one, Reacher (played by Tom Cruise) replies that it’s three against one. He’ll need to contend with the leader and two wingmen. The last two always run. And there’s a lot of truth here.

Before getting to the true parts, I do need to say that there is a problem with the casting of Tom Cruise as Reacher. While he’s a fantastic actor, he’s just way too physically small for the part. Tom Cruise is 5’7″ and about 150 pounds (that’s 170cm and 68kg in tyranny units). Reacher is supposed to be 6’5″ and 250 pounds (195cm and 113kg). When it comes to unarmed combat, that’s night-and-day. The amount of damage a muscular 6’5″ man can do in a single punch is so much greater. Plus all of the street toughs here look to be under six feet tall; a 6’5″ man would be able to hit them at distances they can’t hit him (the name “Reacher” actually comes from frequently being asked to reach things for people because of his heigth). He’ll also have an absurd advantage in any kind of grappling because of his substantial mass advantage. If you imagine this scene with a 6’5″ tall guy instead of Tom Cruise, as it was written to be, it will feel a lot less unrealistic.

But even with Tom Cruise, the basic psychology is correct. A lot of fight analysis and even fight choreography assumes that people in a fight are like video game enemies—all willing to fight to the death no matter how much damage they’ve taken. In reality, most human beings dislike pain and try to avoid it. Moreover, most people who become criminal toughs don’t do it because they’re hard working, disciplined, clever, capable, and adaptable and choose to not go into legitimate business because Evil is their passion. A great many people are happy to kick a man when he’s on the ground but would prefer to wait until he’s on the ground to engage. Cowardice—which is quite common—will have a very similar effect to people waiting their turn.

This aversion to getting seriously hurt will also influence the actual attacks people make. They’re going to be far more likely to only get a little close to the good guy. The downside is that they won’t be able to do much damage if they do hit him, but the huge upside—as far as they’re concerned—is that he won’t be able to do much to them. But they’ll still look like they’re doing their part.

A similar sort of thing will also explain the good guy taking bad guys out with a single punch. Now, a size, strength, and technique advantage will tend to make his punches far more effective than theirs, but the bad guys being cowards will also do a lot of that work—after getting hit, they’re going to be far more likely to exaggerate how much they were hurt. After all, they probably don’t care very much about the objectives of the evil organization for whom they work. As bullies, they’re happy to hurt people who are weaker than themselves but when it comes to fighting someone who is stronger, their chief aim is to protect themselves. This will be as much to protect themselves from the evil organization as from the good guy; if they just run away the evil organization might shoot them as a deserter. But if they fight a little bit and get a minor injury then play it up for all its worth, well, they probably won’t have done any worse than anyone else on their team. If you get hit in the head and it only hurts but you lie on the ground until the fighting is over, who is to know that you weren’t really knocked unconscious for a few minutes? Or if the good guys hits a bag guy in the stomach, will Team Evil really administer medical tests to find out if it was a genuine liver shot or if he was just lying down because it was much safer?

I know that in the movies Team Evil will capriciously shoot anyone who survived who doesn’t tell his story convincingly enough, but in real life foot soldiers aren’t unlimited and while there are certain advantages to having the people on your side believe that you’ll shoot them if they fail so they will consider fighting to the death, this has the unfortunate side-effect of encouraging desertion and never noticing the opponent because if you never start a fight you won’t get shot for not finishing it.

Also, soldiers who all fight to the death die a lot, and there are a lot of circumstances where a tactical retreat is far superior. (People who won’t retreat are very vulnerable to being picked off a few at a time because they won’t retreat to where there are superior numbers.)

Of course, the unarmed one-on-several fight is the most extreme possible example. In real life people often carry weapons and don’t tend to fight in large arenas. Somebody, like the good guy, who routinely gets into fights might well wear at least some level of body armor. Especially with modern materials, it doesn’t take a lot to get a pretty high level of protection from fists and knives. Body armor that protects against rifles is cumbersome enough that it’s questionably worth it, but armor that protects against handguns is significantly more practical. (And it works to add decorative abs and pectoral muscle bulges to body armor.) Add in a complex environment that a clever person who has practiced can take advantage of and the one-on-several fights become quite a bit more realistic.

Of course, any kind of fight is extremely dangerous and a one-on-several fight is particularly dangerous because it’s so much more likely that a mistake may get exploited. I’m just saying that they’re not laugh-out-loud implausible if written correctly.