Steelers defensive lineman Cam Heyward was flagged for unsportsmanlike conduct after a Bills touchdown pass in the third quarter of Sunday’s game and he revealed why he lost his cool after the 26-7 loss.

Heyward was penalized after one of several verbal exchanges he engaged in with Bills quarterback Josh Allen, who had just thrown to Keon Coleman for the score. Heyward said he was upset about some extracurricular activity from Allen after a play earlier in the game.

Heyward said Allen kneed him in the stomach intentionally after Heyward tackled him earlier in the game.

“Ticked off the entire game because, as a quarterback, they’re protected, but I’m not,” Heyward said, via Brooke Pryor of ESPN.com. “It just pisses me off. . . . He even said after, ‘I had to do something to get you o

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