If you were pondering what was Lucas Baker's fate after the ending of Resident Evil 7, this solves it. It's kinda weird too, the "Mines" segment of the main game is somewhat short, while here it not only sounds but feels closer to what the "Self destruct sequence" of an older Resident Evil game would feel like. Chris has a couple of powerful weapons to himself, most of them can be dealt by a blow to the head and his famous Boulder punch which just one-taps them...
Honestly, it's worth a playthrough if you care about the story of Resident Evil, and if you're wondering where they'll go from here.
Oh, also, I still don't get why Chris looks like that. lol