Mr. and Mrs. Mazikeen Smith - S3-E3
Factual error: The therapist says to stop the bleeding, Maze will have to remove the bullet and stitch him up. Gunshot wounds are complicated. To remove the bullet one must first perform an X-ray to see where it is, and after the surgery is completed, especially for a gutshot, surgical drains need to be installed till the wound heals. It's a hollow space that will fill up with bile and nastiness and drains are needed to collect the fluid, or else it will just get infected. If only it were that simple. (00:26:30 - 00:27:00)
Answer: It's Lucifer's blood from when his wings got hit by the bullets. As Lucifer spreads his wings, they're white, and before he wraps them around Chloe, you see a bullet hit his wing above his right shoulder, and the spot turns red. After that, he continues to get shot in the wings before fleeing.
Bishop73
Agreed. His wings take damage and "bleed" similar to how he bleeds when Decker is around.
Ssiscool ★
If they were normal bird's wings, the lower part where there are just feathers should neither bleed like that nor be able to stop bullets, but they are angel's wings, so they behave differently.