The sound of Rocket angrily shouting was muffled a little by the fact that when he landed? He landed with a huge, heavy bag of equipment on top of him. He'd been digging through a sack of supplies he'd gathered, tinkering with his own weapons and the gun he'd made for Six, when he poofed.
Now? This. He wasn't hurt, of course... but his dignity? Yeah. He was pissed.