how can he set stun so immediatly? (irelia)

Hello can someone could explain me how is it possible to set the E so fast as Irelia, i tried to do it on training tool but i feel i m always longer than him at this moment. 5.30 is there an option where you dont need to push the button one more time to reactivate the skill? like if you remain on e does he instatly reactivate it? cause i dont see how, when i try i push fast than i can, but it is still slower than what he does.
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