Bone Skewer

Q. My enemy controls BF1 (has a hidden Bone Skewer) and BF2. I move Unit1 that has a move trigger to BF2. My enemy reacts to the move item with the hidden Bone Skewer. It resolves and the enemy pulls Unit2 from my hand to BF1.

1. Which battlefield would start showdown/combat?
2. If BF2 was open instead, which battlefield would start showdown/combat?

A. In both scenarios, a showdown would be staged in both battlefields because I contest both (323.8.), even if combat becomes staged after (323.12.). As a result, I have the choice to decide which battlefield starts a showdown/combat once the chain is empty

Q: I play <<Bone Skewer>> and target a battlefield I control. My enemy reveals their hand and I choose their <<Clockwork Keeper>>. When it is played, does my enemy get to draw 1 for free?

Rules for Context - Card text of “ignoring any and all costs”, 356.1.b.

A: Yes.

Card text now reads as:

[Hidden] (Hide now for [A] to react with later for [0].)

Choose a battlefield. An opponent reveals their hand. You may choose a unit from it. They play that unit to that battlefield, ignoring any and all costs. If they do, then do this: [Stun] it. (It doesn't deal combat damage this turn.)