L4d infected model problem

first im sorry (im not american so can use english very little)
l4d infected model(not special infected mdl) problem.
that screenshot…hmm…
models neck & wirst(?)…
wirst is no ragdolled
neck is… umm… you can see screenshot
how can solved that problem???
please help me.

Not understanding. Do you mean how it looks from afar?


And looking at the spazzy neck I would say you’re using the smoker phymodel for the common infected.