As the man tumbles, Tempest changes direction and decides that a head-on "distraction" is probably a lot better than just ambushing him near the back. She grabs his arm and tugs him towards her, leaning close to whisper the sleeping spell in his ear. Hopefully low enough that Charlie doesn't hear it and fall asleep himself, but.

The man goes limp in her arms almost instantly, and she drags him behind some boxes to hide him for now. Then she goes quiet again, listening, because there's never just one.