Zombies are scientist?!?!

[Nycticorax]

Nah - if so he would just 'cripple' you in that way when the other infected is chasing you, or the worm is after you etc etc etc.

I second that. More precisely, making the assumption that Clarence is the only cause of your death when hit by the creature in the Lab would imply that the creature's blows and your death are mere coincidence. But that's absurd. So the best of way of answering this post is:
- Swanson is not the creature in the Lab (she's dead then)
- Therefore the creature in the Lab is really an Infected
- If 'Zombies are scientists?!?!' means 'Are Zombies in fact non-infected scientists', the correct anser is 'No'
- If 'Zombies are scientists?!?!' means 'Are Zombies in fact Infected, such that those Infected 'were' scientists prior to their infection', the correct answer is "it's ultimately undeterminated, since nothing could prevent an Infected to be a pub landlord and not a scientist prior to the infection."