Blue outline of enemies

Question

Sometimes enemies in the game become outlined in blue, like in the following picture:

It does not seem to be connected with outlining the enemies that are obstructed by the environment. Those are certainly not glory kills markers (when an enemy waits for a glory kill it remains static and the blue shade is all over it; here, however, the enemy remains alive, active, can attack and blue is just at the borders of its body). I think it might have something to do with using rocket launcher, but I am not sure. What does the blue outline mean?

Answer 1

These are Empowered Demons.

Empowered demons are a game play mechanic which first appears in Doom Eternal, [...] Slightly stronger versions of the ordinary demons, they can appear in most of the game's levels as a dynamic element, and drop greater rewards when killed.

[...] The initial conceit of empowered demons is that they were demons who had killed other players during their own campaigns, and that the empowered demons would gradually grow stronger unless eliminated.

Note: the wiki does state that the outline should be yellow, however I have seen it to appear blue sometimes (having had played very recently - I don't know if this is an update, or a UI choice to affect colors).

Additional Note: the only thing that is blocking the outline is the Revenant in front of it. Outlines for Empowered demons appear through solid objects, but not other Demons (which can make it much easier to spot Spectres for example). You can also see the opaque section of the back leg obscured behind the door frame.