Here’s the event sequence while still fresh in my head:
I kill Khagan as tank with a lengthy tile combo, no dots or effects on him.
Opponent’s Mother North activates her special.
Khagan does NOT appear, however his special goes off next. You can see and hear the ability.
At end of turn he is still not present.
During my next turn I put tiles through the middle just to ‘check’. Nope, not there.