Bit of a strange video? For one, don't really see much of a feeding response? Although it must be shooting out nematocysts like crazy, the damsel looks torched by the end. The actual act of the fish being pulled into the anemone is over in the first second and then it's two minutes of the damsel just sitting there dieing. We don't see anything leading up to the moment and it makes me wonder how healthy the damsel was beforehand to just be delicately pulled into a bleached sebae and then just lay down and die without seeing any feeding response in the anemone itself.
Plus the setting is totally unnatural looking with the bubblers in the background.
Does show that clarkii's can be mean little SOB's though!