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.
Glenn FordI dont know how it is now but the assistant stage manager had to understudy several parts. You had to be ready to go on at any time if the actor couldnt make it to the play. I didnt think anything of it.
Glenn Ford