Neville extracted her knives from her hands, tucking them away where he'd seen her stash them before. Then he picked up the rest of his shirt again and went over to the snake. He wrapped the shirt around his hand and pulled two of the fangs from the beast's mouth, folding them into the fabric and then putting them in his pocket. He thought they might be needed to help treat the poison, but he also knew how valuable they could be. Thinking for a moment, he pulled another and kept it in his hand.
It had been obvious that Elektra was pissed, but he also had to assume she didn't know what he was doing and it would dissipate once he was actually able to explain. He cast a levitation spell to keep her floating out in front of him and started through the maze again.
It took hours, more fights with spiders and rats and a bunch of backtracking to avoid some kind of wolf that Neville was just too tired to fight, but finally, he spilled out into the library, Elektra's still body leading. He set her down carefully, collapsed on the floor and pulled out his phone.