The beast and I were just playing (we'd been out for several hours) and he went to spin round me and down the hallway and smashed his leg (knee?) into the corner of a wall and made a significant dent in the plasterboard.
OUCH!
Of course he ran and got his toy then came back and was like owee my leg hurts. Then he wanted to wrestle again.
No yelp, no sign that he wanted to stop, just a pronounced limp and at one point he looked down at his leg like what the is going on there? 