I have set a multiple creature ambush up with 4 leveled draugs. I have changed the masterambushscript ambushontrigger to true.

I placed the draugs at the far end of the room, but they don't appear to act when I enter the trigger zone.
They do attack when I approach though, but if I move slowly I can aggro 2 of them instead of all 4.

Are my expectations wrong? The near pair of draug are 5 nordsmallroom tiles away and the second pair is 7 away.

There is no delay in the Activate Parents tab.

Thanks!