Puppet Master & Baltimore Purge

Question: Methuselah A plays Puppet Master with Montano at superior on Vampire 1. On Methuselah A's next turn, he takes control of Vampire 1. Vampire 1 then plays Baltimore Purge. At the end of Methuselah A's turn Vampire 1 is returned to his original controller, Methuselah B. On Methuselah B's next unlock phase, what happens?

1) Baltimore Purge burns sending Vampire 1 to torpor. Methuselah A chooses who goes to torpor.
2) Baltimore Purge burns sending Vampire 1 to torpor. Methuselah B chooses who goes to torpor.
3) Nothing
4) Nothing happens until Methuselah A’s unlock phase which sends Vampire 1 to torpor and Methuselah A choses vampires

Puppet Master
aka Mind Rape

Dominate Ⓓ Bleed with +2 bleed.
Superior Dominate Ⓓ Put this card on a younger vampire and lock them; you still control this card. The attached vampire does not unlock as normal. During your next minion phase, burn this card to unlock the attached vampire and take control of them until the end of your turn.

Baltimore Purge

Requires a vampire.
If this vampire is Ravnos, this is a +1 stealth action. Put this card on this vampire. During your unlock phase, burn this card and each other Methuselah chooses a ready vampire they control who is not older than this vampire; if you control a ready Lasombra, you choose the vampires instead; this vampire and the chosen vampires go to torpor.