Well, at the moment I'm in a hurry, so it would look something like this:
Your Spell
Events
A unit starts the effect of an ability
Conditions
(Ability being Cast) is Equal to MySpell
Actions
Unit - Create a dummy unit ...
Unit - Give (Last Created Unit) the Howl of Terror ability
Unit - Order (Last Created Unit) to howlofterror (Target of ability being cast)
Unit - Give (Last Created Unit) the W/E ability
Unit - Order (Last Created Unit) to w/e (Target of ability being cast)