[Tyhm]

Ordinary:
if(playerenters||timeout){
shootball;
timeout=5;
}

There will only be one timeout running, and that only for the first to enter the level (he sets the timeout, everyone else's setting is ignored).

Multiplayer:
if(playerenters||timeout){
shootball;
timereverywhere;
timeout=5;
}

Timereverywhere makes a seperate instance of the timer for everyone who enters the level. So player 1 has his timeout, etc.