Haaland was overflowing with adrenaline, he had missed a couple of decent chances during the game. He probably felt that he was responsible for it not being a comfortable win and needed to make a positive contribution.
He was fouled but knowing a free kick in his own half would not be beneficial to grabbing a victory he got straight up and struck a perfect pass which left Grealish clean through on goal. If you watch it again, both Haaland and Kovacic are sprinting upfield in support of Grealish, everybody on that pitch and everybody watching knew that was a game winning opportunity only for Hooper to do the inexplicable and blow his whistle.
No wonder Haaland and the rest of the team surrounded Hooper, he was lucky he wasn’t decked. I think in light of the refereeing our boys were remarkably restrained.