When you are crawling in the prone position and encounter an obstacle, the game automatically forces you to stand. I've lost count of how many times I've been trying to go unseen and have been revealed by this automatic stand feature (And killed soon afterward). I'd ask that instead of forcing the player to stand, you merely impede his movements while prone. This way, the player is inhibited from crawling unrealistically, but isn't forced to reveal himself accidentally. Thanks for reading BIS.