Re-casting a battle that was bounced to hand with Remand will cast back half

Here's the situation that happened:

- Player A had an Invasion of Innistrad. Player B cast Remand when player A was attempting to cast the back half.

- When player A re-cast Invasion of Innistrad, it would would resolve as the back half.

Saw the same thing for other battles. It's important to note I've only seen this for Remand type effects (bouncing on the stack). Battles seem to work normally when you bounce their back half via things like Boomerang and stuff.

Reproduce the Invasion of Innistrad and Remand sequence, then trace how a battle bounced from the stack is represented when it is cast again. Compare that behavior with bouncing the back half using Boomerang; done means re-casting after Remand no longer resolves as the back half, with the other battle cases still working.

Written by the indexing model from the issue text.