Thwarted in its dinner plans and now trapped, the monster's taunting sneer disappeared as it gave a low growl and a futile tug of Wanda's arms. Otherwise it remained frozen, Iron Man's assumption was correct; it's host's head was important. If Tony's disdain was meant to poke at the captured beast, he'd succeeded. It glowered in impotent rage and sprayed him with bloody spittle from a bitter laugh and snarl, "She's nothing. Powerless. Stupid and broken-" The invective ended in an abrupt gurgle, a strange expression twisting its face as though it were fighting some invisible foe. And then it was gone.
Whether it was the demon's distraction or something in Tony's words that stirred her, Wanda briefly regained control of her body. Staring out of her own bloodshot eyes, exhausted and face drawn with pain, she gasped three words, "Energy. Blast me." She'd hardly got the desperate command out before she froze, her body convulsing as the horror within battled to regain control. A frenzied inhuman shriek escaped her mouth and her eyes went dark again, the demon gnashing her teeth in its anger and fear. It hissed terrible curses at itself, at the woman fighting it for dominion over her own body. It thrashed and muttered until it could force her consciousness down completely and turned its gaze on Iron Man.
Twice it had underestimated it's vessel, but it wasn't going to pay the price again. The demon called Tony's bluff, gambled on what it knew from Wanda's own thoughts that Iron Man wouldn't decapitate her. Even if he did, the beast was desperate now. With another terrible howl it threw back its head and struggled against him with preternatural force, trying to wrench its arms free of the suit's hold. The demon used it's strength as leverage, pushing and pulling against the armor, trying to crush him to the wall or fling him across the room. It didn't matter how it escaped, so long as it could free itself and finish this. One of them would leave this room, and the demon would make sure it wasn't Tony.