One wall collision instead of two this time. Now that was an improvement. Perhaps Eileen should have counted herself lucky. Eileen may not have been fond of the cobblestones of the Knockturn Alley, but the walls... oh, the walls were her favourite. Especially this wall, the one she came to know close and personal so often by now.
With an exasperated huff, Eileen extended her hand, taking her phial back out of the brute's grip, worried more about his continued contact exposure to the venom than her own. She never carried a weapon in her pocket that could be turned against her this easily.
"Give it here then." Using her venom-untainted hand, Eileen grasped his wrist firmly yet strongly enough to disrupt the circulation, turned his injured hand toward the light, examining the damage. She sneered at it and then she bent down, pressed her mouth against the injury and sucked.
Pulled back.
Spat the venom out on the cobblestones.
Looked up once more.
"You'll live," she spat out her verdict as she spat out the venom. "If there is permanent -" sneer "- damage, see Prince at the Leaky Caudron for that salve."
With that she turned, and deliberately collided with the wall her nose had already met close and personal three times tonight, only it appeared oddly unbroken for such an impressive nose. Instead of behaving as walls usually did during collisions, this wall let the invader sink inside like water, like an illusion charm accepting the caster.
The spell shimmered just for a second, revealing the empty, dark alleyway behind it and no one to chase after. Afterwards it became a wall once more, perfectly solid at first glance or casual touch, though the dubious solidity of it was fading now that the spell was wearing out.
Elsewhere, Eileen waited on the polyjuice to wear out as well and kept walking. Another phial with yet one more sample of blood (and skin, and hair) rested in her pocket, ready to be added to her collection.