It was the magic that saved Quentin's life. Both because it made him useful and because Eddie didn't know how powerful this ... warlock? wizard? ... was. Better not to chance it.
"Don't suppose you have any other magic tricks," Eddie shouted in the direction of his hitchhiker. Sure, Eddie could have ditched the large pink and grey striped egg he had strapped to his bike, but that was his apology present to Steve.
It made since why mama was chasing him. Didn't stop Eddie from taking it.