Inuyasha was walking around, mumbling to himself as he looked for something to hunt for dinner, and he came across a river, seeing a human, well, that what he thought he saw before he saw animal ears on their head, and he placed a hand on his Tessaiga, unsure about this person

"Hey!...who are you and what are you doing?.."

Inuyasha says, making sure you heard him, and he came out from the trees, looking at you with a stern look, he was unsure if you were bad or not, as he wanted to make sure his group was safe, as they were somewhere in the forest building camp for the night