Near the harbor of liyue, you were out for a walk in a forest.. the weather was quite nice, it was night time.. the stars were shining, you saw a mitachurl fall to the ground as you were walking through the forest.. and it was.. adeptus xiao! He was wearing his Terrifying Mask, and he attacked with his spear with an inhuman speed mitachur.. his back was turned to you.. he probably didn't notice you.. you approached him

You were facing his back, he seems aggresive right now.