Help with Region Triggers

[Thalki]

Hello guys , Im currently working on a trigger, for when a HERO unit enters a location, mobs will spawn from locations a distance away, Spawn 2 adds, wait 15 seconds, spawn 2 more, wait, spawn a boss. However, when I leave the location and enter it again, it basically resets and starts over. I have a trigger stopper towards the end, however it is a very long trigger, so Id have plenty of time to reset it = / , I have no idea how I can stop it from being played again before the end, help much, much appreciated!

 

[Thalki]

Events: A Unit enters [LocationTriggerEvent[

Conditions: (Triggering Unit) is a Hero) Equal to True

(edited down a bit) Actions: Camera Shake for player 1, camera shake for player 2, magnitude 5.00
Wait 3.00 seconds

Spawn 1 [mob] at [spawn01]
Issue last created unit to attack to [attackpoint]
spawn 1 [mob] at [spawn02]
Issue last created unit to attack to [attackpoint]
Wait 9.00 Seconds
Same as trigger before, spawns more mobs
Wait 13.00 seconds
Move [Boss sitting in corner of map] to [bosspawn01]
Issue last created unit to attack to [attackpoint]
Turn off this Trigger.

I kinda, sorta hope this helps. :X