I don't think SWAT members roll flashlights and why? They have flashbangs & cyalume (sic?) sticks. Some SWAT also likes fast aggressive action where lights are used to blind the opposition. They will literally flood them with lights (weapon mounted, helmet mounted, ballistic shield mounted - gee is that a Chevy coming into my room?)
A regular patrol officer may roll the flashlight or at least have the partner do it. That was what we were taught. The problem is recovery of a lit flashlight. Opps.