Hello,

this is how to spawn a npc_zombie without the headcrab on the head.

general logic:
the "npc_zombie" has a input called "ToggleHead" with the parameter "0" and "1". this input toggle the visibility for the headcrab on the zombie. But when the npc_zombie die, the dead headcrab will be visible again and just fall out of the npc_zombie. To solve the headcrab issue and keep the npc_zombie headcrab free, i dont actually kill the zombie. But it looks like it. I use a "math_counter" to count the hits the npc_zombie receive. After 10 hits with a bullet (or any other hit), the "math_counter" say the npc_zombie to ragdoll. That means the npc_zombie fall to the ground like dead. To prevent the npc_zombie from dying, because dying makes the headcrab visible again, i overide the health from the zombie to a high number (like 2000). After all it looks like the npc_zombie drop dead from bullet damage.

One issue appear asap. All other damage sources like a explosion (barrel, grenade) wont kill the zombie or drop it. To solve that it needs further investigation.

Lets Go!!
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1. In the first gif you see how it looks when the headcrab is toggled off but reappear when the npc_zombie die.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3012142345

2. In the second gif you see the npc_zombie drop "dead" (its not dead it just ragdoll on comman) without the headcrap reappearing.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3012143324


3. i try to show the whole system but you need to understand how to use the entities i use.
1. npc_zombie = this is the enemy zombie we want to spawn without the headcrab. The npc_zombie give output when hit. Every hit the math_counter will count.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3012150243

2. trigger_multiple = this trigger gonna forcespawn the npc from the point_template. any trigger can do.

3. point_template = the point template spawn the npc_zombie and override the npc_zombie health to a high number (2000hp). It prevents the zombie from dying. Thats basically the reason why the headcrab not spawn. It also enable the math_counter. It also toggle the visibility for the headcrab. In picture 5 (point 5) i show the input/output and parameter.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3012150788

4. math_counter = this entity is counting the hits the npc_zombie receive. When the npc_zombie get 10 hits, the match counter force the npc_zombie to ragdoll. It looks like it drop dead but it is not dead.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3012151798

5. like visible in the picture below (red square) i use a input named "ToggleHead" with the parameter "0". When the point_template "ForceSpawn" the "npc_zombie" by a "trigger_multiple" it also output the "ToggleHead" "0" and remove the headcrab shotly after the npc_zombie appear.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3012026124
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I hope you can understand how this works. I tryed to create a video tutorial but it is realy hard to do for me. Maybe its at least a inspiration for better solution.
feedback is welcome.