There’s a difference between remembering your training and being in proper physical condition.
In fact, if your film training involves different martial arts for each film, you probably would suck at actual fighting due to having to think about each thing you plan to do before you do it.
If you know one way to take someone down, if they come at you, you’ll reflexively do it.
If you know 30 ways to take someone down, you’ll either use the one you’ve used the most, the most recent one, or you’ll have to stop and decide which one makes the most sense in the situation—and that hesitation will mean you’ll lose against anyone well trained in a single discipline.
There’s a difference between remembering your training and being in proper physical condition.
In fact, if your film training involves different martial arts for each film, you probably would suck at actual fighting due to having to think about each thing you plan to do before you do it.
If you know one way to take someone down, if they come at you, you’ll reflexively do it.
If you know 30 ways to take someone down, you’ll either use the one you’ve used the most, the most recent one, or you’ll have to stop and decide which one makes the most sense in the situation—and that hesitation will mean you’ll lose against anyone well trained in a single discipline.