Valve Teases the Spitter in Left 4 Dead 1

A while ago, Valve were (more or less) gently accused of nicking the Left 4 Dead 2 “Spitter” infected directly from their own forums. Various affiliations, for and against, were causing people to shoot straight from the hip, emotions ran high and great drama was stirring in the air.

But could it be that this concept had already made the records before the aforementioned PR debacle, and better still, is visibly foreshadowed in Left 4 Dead 1?

We all saw this during our various No Mercy playthroughs, either in survival mode or during campaigns, not paying much attention to an x-ray image of a gross, hyperextended neck on a Mercy Hospital corridor wall… wait, what, a hyperextended neck?

What do you think?