BB Ambush vs Obedience

Mateusz wrote:

Following Situation:

Mata Hari declares an action, gets blocked by an older vamp with DOM, Mata Hari plays Blood Brother Ambush, Blocker wants to play Obedience ... how does this interact?!

I am quite sure, that obedience cant be played here, but i wanted to have my guess confirmed!

Blood Brother Ambush
Only usable when an action is blocked.
Combat does not occur. Put this card into play. While in play, this card represents an ally with 3 life and 2 strength who can strike for 2R damage; this ally enters combat with the blocking minion. Blood Brother Ambush may play cards requiring basic Potence as a vampire with a capacity of 3. If a card would give them blood, give them life instead. Burn this card at the end of combat or if the combat is canceled.

Obedience
Only usable if this vampire is about to enter combat with an acting younger vampire.
Unlock the acting vampire and end the action. (Do not lock this vampire if they are blocking.) The acting vampire cannot take the same action this turn.

Thx