[this totally works as for making a door! But kind of hard to see what they're about to walk into...

Just kidding.

it's a nightmare. They're walking into the moments just before the boy and his mother were killed. Where the Joker is taking a crowbar to his head, giggling as he asks him which hurts worse, while the boy keeps up a-- very familiar bravado.

Whatever Jason was about to say, dies on his lips.]