Something like, unsynced? 
of corse its a animation wich is not synched.
who i said often its has been removed due a reason or other
at least i think it was used for bug the players
like the knive bug
if you do a sealth then the player moves and it fails the player can move as a dead man in him screen and not allowing him shoot
like extinguisher
if you use on player and it dont works he will coughing for sometime
thats maybe why removed
the another way be removed is a bug wich is not working and causes game crashes.