Er... that FL isn't necessary, unless you plan on the enemy appearing the second time a player enters the map?
Setting the H/V Trigger to run event 91 (and adding DNP0091 between ANP and END) could help, I think.
If I could post from a PC, this whole thing'd be a cinch, haha...
From what I could tell, adding the DNP caused it to disappear when the event triggered. I've also tried changing it so that it was shootable and had 100HP. When shot at, it disappeared but it still didn't move. Perhaps I need to try changing the entity?