During LaCroix's briefings, if you lose Masquerade points before talking to him, he will in some instance chew the player character for violating the Masquerade.OR, if you are a Malkavian/Ventrue, you can use Dementation/Domination against him to make him forget. Or you can avoid Humanity loss completely by sending the dismembering serial killer Gimble, which also saves you the trouble of having to fight him yourself. The obvious solution is to send a girl from Asylum to the blood bank, but if you hold off on the quest you can instead send the annoying Masquerade-breaking ghoul Patti, killing two birds with one stone. The quest Replanting A Lily is a great example.It also grants less XP and a humanity loss. Attacking the latter just results in a fight with a stronger than average human that is entirely possible to win invoked bypassing the later fight with him entirely.
Attacking the former results in him assuming his war form and most likely killing you horribly. There are two doors that lead straight to the Hollywood sewer system, and can be used to go back and forth to the surface for blood refill/needed supplies.
