Immortal Grapple - can be used by an ally?

An ally can play Immortal Grapple? (for example a Blood Brother Ambush)

Grapple. Only usable at close range before strikes are chosen. A vampire can play only one Immortal Grapple each round.
Strikes that are not hand strikes cannot be used this round (by either combatant).
As above, with 1 optional press. If another round of combat occurs, that round is at close range (skip the determine range step for that round).

And if yes, can an ally play Immortal Grapple more than once? (for example, to cycle)

Leech
Requires a ready mortal, ghoul, or mage.
Ⓓ Steal a blood (it becomes a life) from a vampire controlled by another Methuselah and unlock this ally. Burn any conviction cards on this ally.
This ally may play cards requiring Potence as a vampire until his or her next unlock phase.

I have a deck that enables a certain Mr Muddles use Immortal Grapples via Leech since a cross table ally is often quite ready to donate one blood on one of their vamps to fuel Mr Muddles' rampage on a naughty common foe.