The effect of the slashes only occur after he's done slashing.
He's also the second to appear after the debut of his fellow Battle Butler, Valkenhayn. His family has served under them as bodyguards and assassins for generations. Badass Longcoat: A standard NOL one, which he trades in for a Badass Cape in his playable appearance.Ax-Crazy: Act 3 of Central Fiction reveals that the kind, loyal, hardworking young man we saw in Chronophantasma was a mask that hides a deeply disturbed individual.Even most of his move-set contains a bird/avian motif. His portrait in the fourth game has a flock of crows in the background, his shadow clones dissipate into shadow crows when they disappear, and he himself disappear into crows in one of his win poses. Almighty Janitor: He's said to be about as tough as Jin, despite being lower rank.
Switching the imagery to a moonlit foggy night, Hibiki distracts the confused opponent with his clone and then proceeds to deliver some beatdown, ending with him and his clone doing a cross slash across the foe, killing them. His Astral, Amatsugomori Nakikarasu/Divine Nightfall: Raven has him doing a crossing slash and then the screen turns black. His Exceed Accel Sakuougi: Haraebina/Mark: Purification has him doing 2 somersault kicks that launches the foe upward, then doing a powerful circular slash as they come down that knocks the foe far away.