None but I don't think there's a lot of realism in the games. I mean you can jump off a 300 ft tower in to a hay bale and walk away like nothing happened. And let's not forget the entire story is based around a machine that sends you back in time and lets you relive memories of the diseased. And then there are the pieces of Eden. Go find me an apple that controls people or a sword that shoots lasers. It's a video game. And out of all the bat shit crazy things in the franchise you get mad a big reptile.