One of those sources of Death energy flares brightly to anyone with the sense to feel it, a wave of cold entropy rushing out into the world along with a distant flicker of green light. Should Leblanc Sr search out that source, he'll find the pale dhampir floating in the middle of the hallway, glowering at a puddle of mirror-water.

Aurelia might have overreacted the moment a reflection of herself had jumped at her, and the whole area is still icy cold. She's in an unpleasant mood, separated from her lab, her friends and in general plunged into an unknown situation, so when she turns to the approaching man she stares him down in silence rather than introducing herself.

There's something vaguely familiar about him though.