An actor would be foolish to do something that might hold up the picture, or more importantly incapacitate him. If an actor does do a stunt he needs to make sure a stunt man stands by to see that it's done correctly. ↗
One of the things I've learned as a filmmaker is to have some aspect of the movie be something that I admire greatly, whether that's an actor I'm working with, the subject matter, or a book. ↗