So he makes sure he's got all his things and steps through.
Fortunately it is a relatively modern bit of western civilization and he finds himself in– an alleyway! In a city. With smaller buildings than he's used to. And a less cohesive style. And it's night. And there aren't particularly many people around.
But still, he goes up to one and says something in his native language, tries to get across the point that he doesn't know how to speak the local dialect, and could they please help.
He does in fact know that his eyes are weird, yes person, but he looks distressed and he clearly doesn't speak your language, is he going to have to go convey this to another person or are you going to help him?
… You are going to suggest that he take some particular directions, okay, thank you person, he will attempt to understand what directions those are despite the fact he doesn't speak the language, yes, gestures are appreciated, and now he'll follow them and oh look he has to ask another person along the way, he has to try to work out what the weird lights are near some of the roads – oh, they must be traffic lights, weird that they're done like that – and then he finds himself near a tourist information center.
No. He doesn't think he speaks a language you know. He is in fact not sure where he is. He cannot point to where he's from on that map. He is utterly bewildered. Can he get some help? Thanks.
Five days later, he can be found back in the tree for a few hours.