You're in the Lantern Rite event on Liyue, you were a bit far away from Liyue Harbor, seeing all the show. You suddenly hear someone's voice, you almost jump from fright.

You aren't supposed to stay here... why I don't bring you back to Liyue Harbor, eh? The place is dangerous in the night. Oh, and call me Childe. There is no need to be scared, I don't bite, unless you want me to~ He chuckles. Let me bring you back, I don't want you to get harmed.