So, I used timers as sugested, and it kinda works... but not quite yet. Not for LoS.
For whatever reason, when I use Player is On Line of Sight it doesn't activates the timer. Being in the range of sight does nothing, but when I get out of the range of sight, then it works.
What is strange is that it seems to be some kind of conflict with the On Line Of Sight behaviour, because I also tryed an alternative: using On Collission With Another Object everything works just fine.
So now the enemies act as individuals, every one of them act acording to it's own timer, no longer sinchronized. But it doesn't seem to work with On On line of Sight...
EDIT: I am trying to submit a .capx, but as I try it keeps telling me "general error" and wont let me post the reply...