Need help making trigger enchanced ability

Need help making trigger enchanced ability

Im trying to make an ability, but the trigger does not work. The caster is removed, but the target is not replaced! help!

Man Catapult
Events
Unit - A unit Begins casting an ability
Conditions
(Ability being cast) Equal to Man Catapult
Actions
Unit - Remove (Triggering unit) from the game
Unit - Replace (Target unit of ability being cast) with a Catapult using The old unit's relative life and mana

What exactly does the "Man Catapult"-Ability do? Where is it taken from?

Edit: Tested it, simple solution:

Change the order of the actions, first replace the target unit and then remove the caster

Man carapult uses the shadow strike ability as base, no damage or anything, it just has the properties I want.

Its similar to the Mount Hippogrph (Just copying that ability didnt work for somereason) in many ways, its supposed to allow a Siege Enginner to well man an unmaned catapult (Will add checks for that).

Thanks for the soloution.

NP, took me 2 min. The problem was when the caster is removed, he doesn't cast any more (but i first didn't believe that the game checks this THIS fast)