This is an easy enough concept - HUD outlines for objects at close distance when it's dark. I've made a mock-up using a close ranged fight in the dark:
https://imgur.com/a/7Zu7p
Added bonus - the outlines hark back to the original games' vector graphics.
https://imgur.com/a/7Zu7p
Added bonus - the outlines hark back to the original games' vector graphics.