I'm gutted for him.
No idea what happened, as we were at the far end from it, but if it is a break we have to hope that Phelps and Richards both stay fit for the next couple of months at least.
I would be looking to recall Ainscough on the wing at the first sign of any knock to Phelps/Richards/Carmont/Goulding as we need top-class cover should anything else happen.
Little harsh on Cas, but they knew the terms and would have to live with it. Ainy is a proven try-scorer.
I'm hoping (like everyone else on here) that it isn't as bad as is being reported, but expecting the worst TBH.