Need help/tips: V3's Howard the Duck

Hi folks, my understanding is that Howard the Duck thunderquack sig ability procs when he's is brought bellow 60% and 30% and is interrupted if he is stunned. However in V3 he's on a stun immune path.
Any tips how to overcome this debuff or am I in the hands of luck? Thanks
Any tips how to overcome this debuff or am I in the hands of luck? Thanks
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