What are those red glowing monsters supposed to be?
I've seen some objects, like bullymong snow pile and pile of trash to glow with a similarly bright, but green glow.
This is a glitch.
P.S.: but a glitched monster definitely seems much more intriguing than a glitched pile! :)
I have seen that same red bullymong in the exact same spot everytime I reach that point in the game. if it is a glitch then it is a weird one because the glow doesn't go away after it dies or anything and it actually emits light instead of just being a different texture.