A vampire with no circle designation is in his own unique circle. Vampires with the same name (eg. The Embrace, non-unique vampires) do not share a circle by default, each has his own circle of one by default.
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Three's a Crowd
Requires a ready unlocked Blood Brother of the same circle as another one you control in combat.
Only usable before range is determined. The range this round is automatically close, and the Blood Brother in combat gets an optional press, only usable to continue combat.
Rulings
The optional press can only be used during the current round.