He pauses like, well, like a deer caught in a headlight frankly (maybe even a Doe?), before the expression on the mask-like face goes from surprise to fear to... well-

"John. My name is John."

The voice is unnatural, low and reverberating in strange ways and the angle it travels from is slightly weird. But the tone isn't a great booming terror from the woods. It's much more 'aggrieved person who's been walking for fucking ever and it's goddamn cold out and you're asking me dumb questions'.

Sorry, Billy.

"Where is this? Who are you?"