Immediately after the Knightmare sequence concludes, Bruce wakes up and finds himself greeted by a burst of light and electricity, as an armoured version of The Flash offers Bruce a desperate warning, apparently from the future. He tells Bruce, "Bruce! Bruce! Listen to me now. It's Lois, Lois Lane! She's the key. Am I too soon? I'm too soon. You're right about him, you've always been right about him. Fear him. Find us, Bruce. You have to find us." Bruce then wakes up again, leaving it ambiguous as to whether he had a hilariously convenient dream within a dream, or The Flash used his powers to travel back in time. Either way, it's a super-cool scene, and though we only see brief glimpses of The Flash in his costume, he sure looks awesome.