I understand that Ki Throw does not trigger attacks of opportunity from displacing the targets current location. However, I am curious as to the implication of Vicious Stomp triggering. Would it trigger as a result of the opponent becoming prone from the trip, as a result of being tossed into a prone position, both, or does the Ki Throw essentially become a replacement effect of initially going prone, and then being displaced, and as a result of wording, does NOT trigger any attacks of opportunity, even from Vicious Stomp?