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.
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.