
ST. PAUL, Minn. — It turned out Blackhawks center Reese Johnson suffered a concussion in a fight with Michael Pezzetta in the last minute of the Hawks-Canadiens game Feb. 14.
But for several days afterward, that wasn’t clear. Johnson wasn’t sure what to make of what he felt. Was his headache a concussion symptom or just a normal headache? Was his irritability a concussion symptom or just a mood? He struggled with questions like those.