...or anything else which tries to take over spines after destroying them.
So assume player A has an It That Betrays on the board, and player B has a Spine of Ish Sah on their side of the board. Now player A goes to combat, has their creature attack player B, the annihilator ability triggers, and player B sacrifices his Spine and something else.
From the rules:
701.16a To sacrifice a permanent, its controller moves it from the battlefield directly to its owner’s graveyard.
So for my first question: Is the action of sacrifice the movement from the battlefield to the graveyard including the arrival in the graveyard, or, stated in a different way, does the sacrificed permanent enter the graveyard before being taken over by the second ability of It That Betrays?
Whenever an opponent sacrifices a nontoken permanent, put that card onto the battlefield under your control.
Assuming it does (if it doesn't then ignore this second question), then how do the triggers stack? Or better said: Does the Spine go to its owners hand, or to the board of player A?