He was shaking his arm a bit. I heard it but wasn't near the TV at the time. Maybe that was coincidental but if a pitcher is shaking their arm and then leaves the game, I think it's probably discomfort of some kind.
Definitely nothing to be concerned about there. A stud young pitcher coming out of a game early with arm/shoulder discomfort never leads to anything significant.
I assume they're concerned about Brown's usage, which means a a shift to the bullpen in 2023 makes sense for a variety of reasons.
But I really want him to go back to starting as soon as possible.
I've been watching a lot of losing baseball lately. It's not great. Please beat the very bad Reds who are putting a very bad pitcher on the mound today.