Harley may or may not have been expecting a verbal response from the snake, but she gets one anyway. The mouth doesn't move, except for the tongue flickering in and out, but there is a distinct, audible voice, and it may well sound familiar.

"What's healthy for a serpent may not be for a human. What's healthy for a god almost certainly is not." The head weaves left, right, tentatively closer. "There is an abundance of prey here. You could be part of that abundance, dearest. Was there no one worthy of accompanying you, that you're out here all alone?"

He's not scolding. Actually, it's convenient for him that she's here alone, where he can at least get a look at her and see how she fares. Physically, she seems perfectly fine, but there's a darkness in her that calls out to the same darkness in him.