My understanding is thanos didn’t use any power of infinity stones in the infinity war fight and hulk wasn’t previously injured very badly . He almost seemed to easy to be knocked down why ? Shouldn’t he have grown stronger because he is angry because everyone is dying and he is getying beat up ?
Thanos took a punch from Hulk, but beat him because Thanos is a better fighter. Hulk got knocked down, and might have gotten back up but Heimdall sent him to Earth. Maybe angrier Hulk could have been stronger, but we that’s not what happened.