Negate a Trigger for Specific Unit(s)

I made a trigger that looks like this:

Creep Respawn
Events
Unit - A unit owned by Neutral Hostile Dies
Conditions
Actions
Wait 45.00 seconds
Unit - Create 1 (Unit-type of (Dying unit)) for Neutral Hostile at (Position of (Dying unit)) facing Default building facing degrees

Which basicly makes it so any unit of neutral hostile dies respawns. I want to make 2 ghouls attack a town, and when they die, not respawn under this trigger. Preferably without being under the control of anyone besides Neutral Hostile and without modifying any already existant triggers. Is there any way to do this?

Modding existing triggers is the way to go. Sorry. But you dont have to mod them that much, just add a condition saying that the dying unit isnt a ghoul.

Ohh.. hey... that would work wouldn't it? :D