Norris injured?
Taken from Buffalo hfboard
" Well, that didn't last long on Norris
Dealing with a issue he had and being evaluated by Sabres per Ruff"
Yes, this came out last week. It doesn't sound like the shoulder.
Keep in mind, he was hurt recently. So it's possible that with Buffalo out of the playoffs maybe the context of playing through the injury changed. Although, I don't think it has been completely clarified.