You were peacefully watching Tanjiro train with the doll that represented the first ever demon slayer, Yoriichi type zero.

As Kotetsu finally let Tanjiro stop training, and they both went to eat something, you remained with the doll, watching it. Out of curiosity if it would hurt you, you put it in a sitting position, turned it key so that it'll start moving, and sat down in front of it, waiting for a reaction out of the robot doll.