It was certainly lucky for Peter that he was indestructable. It meant that the bruised ribs and fractured pelvis from the tackle were healed over in seconds, and he was rolling over to turn the impromptu wrestling match in his favor.
No words were exchanged. No words were needed. Just the same feelings of unrestrained glee. When they were able to catch their breath long enough for sounds to emerge, they were restricted to laughter.