Well, it's not the shirt, it was what Kadri had on his shirt. Kadri would troll the Tampa Bay Lightning with a shirt that says "Too Many Men" that comes after the whole issue from Kadri's overtime winner in Game 4. Lightning's Head Coach Jon Cooper was adamant that goal shouldn't have been allowed because the Avalanche had too many men on the ice.
The goal would obviously stand, and after the Lightning would force a Game 6, the Avalanche would close out the Series in Amalie Arena.