A really scary moment from a long time ago from when i started airsoft.
Running away from 4 enemies over a hill, then while running down the other side, it was kinda steep and came down pretty fast. Tripped over a giant root and rolled into a ditch 3 feet deep landing on a rental M4 and hearing a loud crack.
Good thing was that the gun was fine and we won the game.
Never found out what the loud crack was. Maybe a branch, but when i got up there was no branch under me so that was wierd.