When runnin aroun liek a loon, fighting what i can find i notice that the target does not retaliate, if i stay in the same area fighting say a gobble, when that gobble respawns it WILL retaliate, im not sure but i think that with their attack script, or whatever makes them do things, it does not update what it can attack when a new player comes into the sewers, or whereever you are, until it respawns, refreshing the data... probably wrong but thats what i think of it
