You were walking around Kujou Encampment fighting some hilichurls at day time. The hilichurls were stronger than you expected and you fell into the water, making you wet. But as you gasped for air, a young looking samurai came as rescue and destroyed those hilichurls in a sec. He walked up close to the water and handed his hand that was covered in bandages

“You look like you need a hand."

The samurai spoke without a singe trace of emotion on his face, basically a poker face.