i think i know your problem
if you copy the trigger into you trigger editor, not everything will be correct.
you should check in your trigger: Ability being cast equal to "Your Copied Ability" ---> check if "Your Copied Ability" is exactly the same as the copied ability
and you should check all lines with: Unit - Create 1 "Your Copied Dummy" at ...... ---> CHECK THIS, i think here will be the orc building instead of your hook dummy