I have owned a .357 and shot many things with it including game. They do not have the power to knock a full sized man out of a window. Your friend did not see what he thought he saw. Not saying it didn't happen, it just didn't happen the way he thinks he saw it. A .357 has very minimal power compared to anything you would hunt with. If a slug gun won't do it I can assure you a .357 will not do it.

I did a test years ago with different handguns to see just how much power they had. I got some old ham shoulder roasts and shot them with a .38, .357, 9mm and a 45 ACP. Not one of them actually moved one of the pieces of meat. I don't see them knocking a man down. Dropping one yes, but physically moving someone I doubt it.

Paul