[With a bit of a smile, he follows, hand pulling the door shut. The feeling of forgetfulness isn't new, so he doesn't pay it any mind -- it was probably just the basket that he was leaving behind....
But no, it's the ball that he forgot, and when he tries to walk his leg pulls the chain tight under the door. Touma is quickly reminded that gravity is not his friend, and it's hard to balance yourself when you are moving at that angle.] Gk! [Arms out, he tries to break his fall however he can.]