Rotating clarification

I have Braggoth on his second from last corner, play beast unit, last turn I had played P ower of the waagh on the wizard beside him. I play his heroic act and chose a culling mournfang rider to play on him, this rotates him to a do damage corner, I then play bellowing voice to activate the heroic act on the mournfang and it does the 2 dmg plus the power of the waagh. But he Braggoth doesn’t rotate.
The other downs have anything in play to stop me from rotating ?
What am I missing ?
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