The fight does show the Hulk getting angrier. When Thor decides to finally really go after the Hulk he rushes in with the Hulk’s big hamer with a two handed swing, The Hulk caught it with one hand and it was pretty clear his strength was increasing. Thor displayed the same (oh crap) I’m sorry look moment that Iron Man had in the Hulbustet fight after the huge roundhouse where Hulk spit the tooth out smiled and growled angrily.
If the fight had lasted longer, there would have been more of those Hulk moments.
I think was Holding back by the fact he didn’t kill Thor after the grandmaster shock and he had Thor in his quarters. He didn’t want Thor to leave and I think it displayed a level of recognition and care.
Think that the Hulk was shown to be stronger than Thor by some margin, was beating him down, but also that once Thor taps into his version of the OdinForce with the Lightning...
Hulk would get toasted, as THAT Thor was to be more powerful now than Odin!