That maneuver isn't a tail slide, this is a tail slide.
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I never taught anyone to use the ability to tail slide , as Ack ack posted, in combat, I only taught them to find the extreme limits of control over their particular airframe, somehow this reminds me of taking Greebo and showing him this many many years ago....when my F4U1 went up against his F6f5 and he wondered how I beat him that particular day....... I told him to meet me in the TA and learn the extreme limits of his flight envelope/control over his plane......
edit: I'm almost positive that these days, Greebo probably can run circles around me........
I don't think I would ever use a tailslide in combat, it would leave me too vulnerable....
TC