The Glasgow Warriors forward sustained the injury during Scotland's 22-13 defeat at the hands of Ireland at Murrayfield. What changed in the fifteen minutes of half time?' It's not anger, it's 'Why did we have such a good first half and then we didn't play the same way in the second?
"It was chaotic in the first half and Scotland probably enjoyed that better".
However, a superb burst from inside his own-half created Ireland's third try, veteran Keith Earls touching down, which he converted and he added a well taken penalty later in the second-half to give the Irish some breathing space.
Johnny Sexton suffered a head injury leaving Joey Carbery to run the game for nearly an hour: the Munster star threw an intercept pass for Sam Johnson's try for Scotland, but conjured the winning score for Earls.
While Ireland kept the pressure on for the final 20 minutes, a fourth try and bonus point remained elusive - but this performance will definitely help put last week's memories behind them, and leave Ireland feeling confident about the World Cup repeat of the fixture.
Ireland had lost the physical battle against Eddies Jones' England team, prompting a week of soul-searching, but Scotland were never going to beat the Irish in a similar way.
"I think we just muscled our way through it". He was also relieved by the team's effort.
"We have a lot of belief", said Ireland skipper Rory Best.
"He got control of things and made a nice little break for Earlsy's try and looked really risky in attack".
"Why did we have such a good first half and not play the same in the second half?"
They also became the first visiting side to win a Six Nations contest at Murrayfield since England's 15-9 success on February 6, 2016, ending Scotland's run of seven successive home wins in the championship.
"He wanted to stay on but his shoulder was not right".
"We can be better, we can play more rugby, and I'm sure Joe will touch on that when we meet up again".
"Johnny Sexton got a bit of treatment out there and he got a stamp on the head but he is feeling better and we expect him to be back in the next couple of weeks", the 53-year-old told the BBC.