Amazing compilation of information, setups, and videos.. great work!
This sounds to me like stun is overwriting the howl effect instead of what it's actually doing which is stopping the fleeing monsters from running away.Basic principles
Teleport to boss, howl those trash mobs away to make the Merc attack the boss, then start spamming WC – not immediately, since WC's stun effect overrides the Howl, resulting in Merc attacking random monsters.
I did offer to do that but you know no one will ever find it now.@maxicek Please sticky this.