He lost out on the roulette of spells since he was closer to her than he'd been before, but luckily the worst of it missed because of her preoccupation with the ropes. He had to Finite a severe Jelly Legs that nearly landed him on his face --and did make him land hard on his knees as well as frantically deflect a blasting curse that came too close for comfort.
Knees still weak though the spell was ended, he lunged at her wand hand while she was still clawing at the ropes on her legs. Without a wand, she'd be much easier to subdue. His own wand was clenched tightly, though, and he was ready to deflect or hex as needed if this try went badly.