'Consider it a bio-electrical blackout.' That's how Pat O'Reidy described this Gift, and it remains the best description there is for it. For a short period, everyone in the room simply goes blank. They still stand upright (unless they were laying down to begin with, but eyes close, senses go dead, and nobody moves. Meanwhile, the Ragabash can move about without being seen, or can take actions they otherwise couldn't. Any actual attempt to harm someone will break the communcal trance, so slitting their throat while they remain unconscious won't work. But you could certainly pick someone up, put him in the trunk of a car,and take him elsewhere. A spirit of electricity or an electric eel spirit teaches this Gift.
The player spends three Rage and rolls Gnosis (difficulty 8). Each success 'blanks' every person in a room for one turn. Supernatural creatures (including vampires, mages and imbued hunters) can make a resisted Willpower roll (again, difficulty 8) against the Ragabash's Gnosis roll. Every extra success the Ragabash gains over his target blanks the victim for one turn.