The instant Cronic felt his strength being depleted, Cronic promptly unleashed a chain lightning spell at the source. 

"Hook, line, and fucking sinker." Cronic said, as he began firing off numerous lightning spells to cripple the Vampire's magicka, either by direct hits or by forcing him to teleport, and to generally keep him off balance.

"I don't know who you are, or where you're from, but you are NOT leaving this place in one piece." Cronic said to the Vampire.

"You attack my boss, you earn the ire of her employee!"