[Tyhm]

if(playerenters) timeout=0.05; sets the only instance of timeout for the NPC for the first player who enters. Every subsequent player enters, and it does nothing because the timeout's already in use.
Timereverywhere makes a new timer for that player when it's called. If you don't have timereverywhere before your timeouts, it'll set the NPC's public timeout instead of the NPC's private timeout.
so:
if(playerenters||timeout){
shootball;
timereverywhere;
timeout=2;
}
will shoot a ball at the leader every 2 seconds.
if(playerenters||timeout){
shootball;
timereverywhere;
timeout=2;
}
will shoot a ball at everyone in the level every 2 seconds.
if(playerenters||timeout){
x=(x+1)%62;
timereverywhere;
timeout=0.05;
}
will move the NPC right one tile for EVERY PLAYER IN THE LEVEL.
if(playerenters||timeout){
x=(x+1)%62;
timeout=0.05;
}
will keep it at a constant speed.