Tamaki's first idea upon arriving in the ritual circle was to disturb the patterns of blood, but that idea turns out to be a bust when the red snow is bizarrely hard, like stone.

Looking toward the Count and his daughters after Pru's shout, though, he has one other idea. It's one thing that ghosts are good at (besides phasing through things and being generally spooky).

Flying quick towards the daughters, he starts trying to possess one of them, turning into a bright blue light and trying to push her own soul aside. He's never tried this on an unwilling host before, but there's a first time for everything.