How do i override a destroy objective Q?

[Doll]

Hey mates.

I allready know how to make a override for a quest where you need to collect a item from a ingame objective.

http://www.wowhead.com/quest=808
like this: http://pastie.org/1039518

but how do i make a override for a quest, where i need to use/destroy the objective and not loot it?

this is the Quest i am trying to overrride:
http://www.wowhead.com/quest=786

thanks