Heidelberg Castle and moving blood

Quick clarification:

Can I move more blood off a vampire than the capacity of the receiving vampire?
e.g. Serena the White has 5 blood when I lock Heidelberg Castle to move blood off another vampire (with 7 blood) to her. Can I move 6 blood, leaving the other vampire with just 1, or can I only move 3 blood as that would bring Serena to full capacity?

Name: Serenna the White
[HttB:U]
Cardtype: Vampire
Clan: Salubri
Group: 6
Capacity: 8
Discipline: ani dem AUS FOR OBE
Independent: Once each turn, if Serenna is ready, she may burn 1 blood to reduce a bleed against you by 2. Scarce.
Artist: Ed Tadem

Name: Heidelberg Castle, Germany
[DS:U2, FN:PR, KMW:PAl, LoB:PI]
Cardtype: Master
Cost: 2 pool
Master: unique location.
Lock to move blood, equipment cards and/or retainers between any two ready vampires you control. (You choose the amount of blood you move and which cards you transfer.) Cannot be used during an action.
Artist: L. A. Williams

as i understand it you can move any/all the blood of the vampire to another vampire.
Excess washes off to the blood bank.
That's why i hate mind rape decks with Heidelberg :}

That does sound like a nasty combo..

best mind rape combo i have seen is steal vamp with for, take all blood off, hunt, then bleed force of will and daring

Yeah, that is an old classic.

Devastating when it happens to you...