Treat the Sick Mind - Action_Reaction

[dem] [ACTION] Unlock an ally or younger vampire.
[obe] [ACTION] As [dem] above, with +1 stealth.
[OBE] [REACTION] Cancel a card as it is played by another Methuselah that would be put on a vampire with Dementation [dem] they do not control. Usable even if there is no action.