premise: Several people move through a long alleyway near a parked motorized scooter. hypothesis: A biker gang approaches a motorized scooter that dinged their bikes to mete out justice.
neutral: Several people could be any group of people, not necessarily a biker gang. They could be moving in any direction in relation to the scooter, not just approaches. They could be moving by any means other than bikes, and the reason for moving near the scooter could be anything, not just it was the one that dinged their bikes to mete out justice.