to me, Puck doesn't sound mortally wounded. Initially he sounds out of breath and weak, but as the conversation goes on he sounds a lot more definite. And I think (especially given the initial reaction to Datu etc) that if he had been bitten and was about to turn, he would have called and said exactly that. after all, with military experience surely he'd be able to remain at least calm enough to report back on the situation.

But, if they're all dead, that makes me wonder why he needs a Dr: for himself, or for someone else?

I feel like this might be a trap, but I have no idea why or by who. Has whoever attacked them now got the gun truck? or is it destroyed? Puck says he needs pick-up I think.

I am sort of erring on the side of zombies. As other people of said, it would be too much of a neat coincidence for it to be mallers. Plus there's all that conversation where they talk about how there can't be that many Little Ones around anymore...