They have to form a Trinity: maybe Annie will come back for that point if the triangle? Or maybe she's just in a flashback. CalamityKate, wete there any more of the old cast listed (uf not, that cld sink the flashback theory).
I did have the horrible idea that loony Lady Mary might have to stand in for Alex in the Trinity, and would go to pieces, or pull out to shaft Hal, as his selfishness about the blood shafted Lady Catherine.. ?