Where is a blood?

Black Mesa Archive In-game Issues (Mod)
#1

https://postimage.org/image/4fbcgtotb/
and 2 steps closer
https://postimage.org/image/oahxibfqr/
This is a wrecked bridge right after freight elevator.

#2

I’ll bet that’s a problem with Source’s decal system, plus Black Mesa’s blood pooling probably doesn’t help that.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.