Twilight Temple (Map tier 6, Kirac's mission) 2 monsters remaining (1,300,643,505)

I tried going back and forth this map hundreds of times, combing every corner and I cannot seem to find the last 2 monsters and I think this map is bugged.

EDIT: My bad. There are some switches I need to press in order for the mosnters to spawn, it seems. Damn.