The black smoke streaming from Samirah forms Ernie above the drop. As the incorporeal demon moves away from Samirah she strikes out with her blade - the flames once again a clear burning light. The cut pulls away some of the demon's black essence, but not enough.
Chancre gestures with his hands like he is conducting an orchestra. Or possibly giving Ernie a rude gesture. Or both. In response all three of the magical force-ful blades turn from menacing Samirah to violently striking at the incorporeal demon but only a single of the slashing, stabbing weapons manages to touch smoke.
Konstantin's forearm frosts over and he reveals one of his ubiquitous snowballs, which he hurls at the demon. The demon, zipping across the false floor zigs at an opportune moment to avoid the hurling ice - the smoke steaming into Chancre's mouth and nose.
A pause, a single step towards the trapped square that would send Chancre's body tumbling into the spiked pit - then a waft of blue flame and the smoke streams right back out.