That's not how that works.

[ Looking at Kaeya's hand before meeting his eyes, Diluc cups Kaeya's face. ] Thank you but I promise I can tell what's real and what's not. [ He sighs. ] 'Adelinde' is here but I know she's not actually. [ What's she says is true, though. ] The trouble comes when everything starts to turn to flesh and blood and I can simply close my eyes and stay still for that, now that we're back home.