Blind Man
One commonly adopted practice is for players to shout the words "Cease-fire, Blind Man" or "Walker" and halt an ongoing game if a player or bystander is seen in the designated game play area without proper eye protection, proper eye protection being goggles and helmet. Any player hearing the words must, in turn, stop and also shout the words, resulting in a chain reaction which halts and alerts the whole game. Once the situation is resolved by properly removing the person from harm, the game is usually resumed at the same point at which it was stopped.
A player is required to keep their face mask/goggles/shooting glasses on at all times. This is basic safety upon an airsoft site and this law is always enforced by the marshal in charge to ensure that all players remain safe and no accidents occur during the game play.