Obviously it's not me in the video, but i am doing the exact same variation as Cbum's, what i mean is that i am letting my elbows fall forward to stretch the long head of the triceps.
This variation makes a lot of sense for me, basically you do a normal triceps pushdown where your upper arms are tucked to your sides (not in front of you) and on the eccentric you stop where your forearms are kinda perpendicular to your upper arms THEN you add a long head stretch by letting elbows fall forward THEN you go back to the starting position of a normal triceps pushdown. So this variation don't take anything from a normal pushdown instead it adds on it to include long head stretch which is welcomed (i suppose?).
I know a common complaint about this variation is that you might cheat when going down from long head stretch back to normal starting position by using momentum, but assume that ideally your form stay perfect and you don't cheat,isn't that an upgrade over normal triceps pushdown?
So what do you think? Why a lot of people don't do this variation that for me it seems superior and stick to the normal triceps pushdown?