Vynthear Klayde:
Okay.
So, GM, how do you want to handle this ?
Penalty to Initiative ?
Acting a round or half-round later ?
You have to climb down, land and situated yourself before doing anything.
You will land in a huge pool of blood, meaning any movement makes noise, and there are alot of watchers below.
Safe to say, I can not see surprise in your numbers, without stealth, being an option.
I would as you appear out of the blue, offer a +2 bonus to your initiative roll, to show you have the "edge".