The grin that spread across the Hulk's face at Iron Man's words was something to be feared, but there was no danger at all to anyone but the dragon he'd just gotten permission to smash.
He crouched down a bit and leaped astonishingly high and far. He landed right near where the dragon had been relocated by the red and blue flying bug. There was a rather large Hulk Sized crater left where he landed.
Another jump, this time from the ground, and he had grabbed hold of the monster and was bringing it down with him and it to was making a crater of it's own as the Hulk sized crater while the Hulk slammed it into the ground repeatedly using his arms to contain it and his legs to just keep jumping it up from the ground and back down. As it flailed his gigantic feet dug into the ground to keep his balance and his roar was angry and annoyed that it was still trying to move. But he kept at it doing exactly what he'd been told by Iron Man. And it was fun.