If memory serves, someone else did also. I don't recall any walking off the field during play though.
I'm sure out of the thousands of players who've ever taken the field, impulse retirement isn't very common.
There are a lot of detrimental attributes and activities that are celebrated, protected, and encouraged. It's gotten worse since social media became a thing.
The guy walked out in the middle of a game. In the history of POS football players, how many have done that?
POS and mentally ill aren't mutually exclusive.