Thor gives Rocket a hum of acknowledgement. They both are probably assholes. Thor could have easily gone over Quill's head, but when he asked him not to tell Rocket, he didn't feel like he was in a position to say no. He could understand Quill's rationale and he's sure that Quill never anticipated that Rocket might someday find out via ghost proxy that his plant-child had died.

Then suddenly, without warning, Thor hurls the final bomb in the air. A hot crack of lightning extends from his hand up to the metal of the bomb. It bursts just as the other one did: in a brilliant, violent display of light and glitter and broken metal shards.