Blocknpc doesn't block npc.

[Grab11]

Blocknpc actually doesn't block npcs. Rancors can 'jump' through blocknpc. I think NPCs can 'jump' foward if they are at 45 degree.
http://imgur.com/a/MJcov

[deathsythe47]

I just tested this and can confirm, however I think they can jump at any degree. I had a rancor jump in a straight line into the doorway of that room on desert.

Also, it is possible to knockback npcs into a blocknpc brush. Very easy to test, just /npc spawn lando in front of a blocknpc and shoot a fullcharge pistol shot at him(don't kill him). He will go through the blocknpc.

I think blocknpc should ideally just emulate the function of what system/textures/clip does for clients, but only apply to NPCs.

Btw grab you should update your gtkradiant, it's outdated.

[Grab11]

I usually use 2013 version.

textures/system/blocknpc
{
qer_trans 0.5
surfaceparm noimpact
surfaceparm nomarks
surfaceparm nodraw
surfaceparm nonsolid
surfaceparm nonopaque
surfaceparm monsterclip
surfaceparm trans
}

textures/system/clip
{
qer_trans 0.5
surfaceparm noimpact
surfaceparm nomarks
surfaceparm nodraw
surfaceparm nonsolid
surfaceparm nonopaque
surfaceparm playerclip
surfaceparm monsterclip
surfaceparm trans
q3map_nolightmap
}

Someone should check if npc can move through clip.

[deathsythe47]

Try this one

textures/system/do_not_enter
{
    qer_trans   0.5
    surfaceparm nomarks
    surfaceparm nodraw
    surfaceparm nonsolid
    surfaceparm nonopaque
    surfaceparm botclip
    surfaceparm detail
    surfaceparm trans
}