I must admit I wondered if Andy had stubbed a toe on the clock there. Hope not!
Looking at it again, you could be right about him colliding with the boarding. He does have a tendency to run into things!
Maybe he just got a wee stone in his shoe
On a hard court?
There was another picture showing Andy in pain during practice, I thought the one you referred to was showing him taking off his shoe to relieve the pain in that foot, could have been his toe he hurt or something in his foot.
Oh please let whatever it is be sorted out before the AO!