We got a Samsung 4k TV and a 4k bluray player recently, & I’ve definitely noticed the HDR difference in the 2 4K Ultra discs we’ve watched so far (Suicide Squad and The Magnificent Seven) - namely, that the dark scenes are DARK. Legit blackness.

Yes, post credits scene was night outdoor shots of Alexandria, then cutting to showing Father Gabriel on the wall keeping watch, but you can tell he’s being watched through binoculars, by the boot-wearing person who hops down from their perch and starts to walk towards the Alexandria gate.