Although both of my BPs strike and constrict their thawed rats (in the classic "dramatic ambush" fashion), I've seen others on this forum describe their snakes eating the way yours does, particularly the ones that seem to be accustomed to drop feeding. As far as being an indication of health or normalcy, both ways are honestly fine. With BPs and their reputation for being picky and inconsistent eaters, we'll take whatever we can get, as long as the snake is eating!