Raph was sure he'd lost the guy in the rain and unfamiliar terrain until he speaks.
Something pings at the base of his skull, something left over from ages ago. A tiny voice that says...

Predator.
Be small.
Hope it goes away.

Raph, who was never very good at listening, continues to advance. Albeit far more slowly than before.

"It usually ain't," he says shifting his grip on the sai. "Don't care about the specifics. You ain't gonna hurt the boy."