Groot tried to run out of the arena, but Hulk blocked his only way out and screamed at him.
Groot was annoyed by his overall smell and immaturity. Groot screamed at him back.
Hulk ran at him and grabbed his wooden arms and Groot did the same. They tried to push one another, but the sheer force of Hulk was heavier then Groot thought. Some of his wooden hands started to get damaged.
I am Groot! (Hey, man, I didn't ask for this! I was just going along and happened to fall in here. Just back off and let me leave!)
Hulk smash tree man!
I am Groot. (But-)
I am Groot! (Tsk! Stinkin' jerk! Fine then!)
Groot produced roots and stuck them into the ground. This anchored him in place. It also allowed him to absorb nutrients & minerals from the soil, strengthening him and allowing him to get some health back.
I am Groot! (Here we go!)
Hulk tries to push him some more, but Groot stays firm. His wounded hands heal and became stronger. He smacks Hulk in the face and Hulk yells in fear and surprise.
Groot creates a wooden shield around him and Hulk smashes it. However, Groot is able to put his arms into the dirt, then rises, grabs Hulk and pins him on the floor.
Hulk tries to free himself from the heavy arms. At some point he is able to rip off Groot's arms and runs towards him ready to punch him to smithereens.
Groot kicks him to the ground and as his arms grow back he throws Hulk into the crowd. There are a few deaths during the process.
Wow! Whoever you are, you're really putting on a show!
I am Groot!? (You're actually happy about your spectators getting killed!? You're a sick freak! Also, I am Groot! Do you seriously not recognize me?)
Well, Groot, keep putting on a show!
I am Groot! (I'll give you a show, all right!)
Groot extends his arm like a vine and grabs the arena owner.
Hey, wait, what-
Groot then reaches for The Hulk. Hulk manages to punch Groot in the throat, but Groot manages to grab him. He then wraps Hulk and the arena owner together with a vine. He grows to super height and throws the tied-up arena owner and Hulk into space like a baseball.
The crowd cheers.
You saved us! How can we repay you?
Groot makes choking sounds from getting hit in the throat.
Are you okay?!
(chokes) I... I am fine. Hey... that punch fixed my throat! I can talk normally now! I'm going to go ahead and order at the snack bar like I've always wanted!