He watches wide-eyed as some invisible force slams the wasps back against the wall. He's never seen the Force being used and it's - well, compared to his gun (now sadly completely out of bullets), it's awesome. He resists Leia's tugging for a moment, still mesmerised; then one of the wasps starts twitching again and he turns and runs along with her.
"That was fantastic, what you did there! What was it?"