It was a pain that would ultimately lead to the end of his career, as well as restrict him to a largely inconsequential appearance for the Leicester Tigers against the Sale Sharks later that day.
The 30-year-old England winger announced his retirement on medical grounds due to a back ailment on Friday, only weeks after he marched off the field in that Premiership loss.
“As I turned to leave Sale, I was aware that this could have been the final one. An hour after his retirement was announced, Watson told BBC Radio Leicester, “I knew I was in so much pain.”
“To get to that stage in the game, I had taken a lot of painkillers and the night before.