Kei falling

On Max's bday last week, we had Mevheen and Kei over for cupcakes. While we were in the backyard, Kei fell down the stairs a bit, but skillfully didn't hit his head. Max points at the place where he fell and says "Kei" in a really sad voice. Now inside the house, he falls to the floor and says "Kei" also... I'm not sure how far Max is going to take this...