The Fiendfyre jumping up and licking at his sleeves can't be warded off by normal spells, but Heine smothers it with a sharp movement of his hand. The cost is that he can't defend against the Imperius Curse.

Weight settles once more into his mind as the last flickers of fire disappear. This time, Heine knows he's supposed to push back, to resist... and he tries. His expression twists and he takes a small step back, halfway raising a hand.