dislocated shoulder

So apparently, while filming a bridge scene for second episode (probably "if he kills her, throw the dog of the bridge" one), Samuel Barnett slipped and dislocated his shoulder. He said you can see him acting troughout first 3 episodes with his left arm not moving at all. I find these things interesting to pay notice of and now on rewatch he does seem to avoid moving his left arm in many of the scenes.