When Hulk was getting him by those sonic waves from those canons he was on his knees, covering his ears he then looked up towards Betty and saw here being held back by soldiers and screaming, with the sonic Hulk just heard it as if she was in pain, straight away you see Hulk get angry, he starts to snarl and gets back on his feet to destroy the canons.
When he battled Abomination, he was being stabbed in his chest and pinned up against a wall, he saw Betty with the helicopter crash and he couldn't overpower Abomination to break free so there was a close up of his eyes where you saw the "gamma fire" in his eyes get brighter and he got angry and overpowered Abomination, gave him some hits, threw him into a building and did the thunder clap.
It was pretty clear that he got angry and stronger despite it not being said in dialogue.