Quantum Entanglement
After the rescue party's return and some subsequent revelations, the Justice League has assembled to discuss the significance of those revelations - and verify their truth.
"I've scanned him every way I can, and everything I do tells me the same thing - 'Lex' is telling the truth. He's not insane, he's not lying. Batman is really in there, his body out of phase, and his mind enmeshed with Luthor. Honestly, I'd say this is one of our best-case scenarios - but it's still not good. By my calculations, we have a limited amount of time to get Batman back to normal before he fades away entirely."
"I've scanned him every way I can, and everything I do tells me the same thing - 'Lex' is telling the truth. He's not insane, he's not lying. Batman is really in there, his body out of phase, and his mind enmeshed with Luthor. Honestly, I'd say this is one of our best-case scenarios - but it's still not good. By my calculations, we have a limited amount of time to get Batman back to normal before he fades away entirely."