There's a pause. Strange obviously expected something to happen from the confused look on his face. Confusion turns into annoyance as he starts muttering again, palms facing Sherlock, hoping that this would work...

and nope. Nothing happened.

Letting out a noise of aggravation, Strange just sat down on the ground, so that it'd be easier to look at Sherlock. "I know the spell. I turned a woman into a cat once, I'm certain I could turn a lizard human. It's just not working."

Surprise, the Ringmaster's better at magic than he is.