Hero Ability with percentage triggers! HELP!

Hero Ability with percentage triggers! HELP!

Hi its me again the lingon man.
I want too make an hero ability that deals 50% of the heros life in damage. I haveallready managed to do that, but im having a problem.
Im using a trigger to the abiltity, which sets the enemys life to= life of targeted unit - life of casting unit/2. That doesnt give the owner of the casting unit the kill. I suppose someone have an easy sollution on this... so please tell me how to get the kill though im using a trigger for the damage.

Help plz...

the reason: no ones dealing the damage, but this can be changed. All you have to do is take that and plug it into the "order a unit to damage target unit for (insert the value her) with type attack. Simple.

Thank u, ill try it of course. If i cant make it work then ill come up again. Thank u again