"Indie", as both a form of music and a "scene", is weak and effeminate, whereas Rock generally isn't (as far as my understanding goes). Rock seems to cater more for the beer-swigging macho crowd, whereas Indie is for the emo kids who are actually "popular", usually due to their tight jeans, capacity for dope, or general hipness, rather than due to any lasting personal qualities.
That panther band are closer to "Rock Metal" than any of these Indie bands.