I think it is the Mallers because Puck has been injured but not bitten.
Puck says "Call the Doc" and asks for a pickup. Puck has made a huge deal about Datu being dead already. he even Snubbed Datu once in this episode. If Puck was bitten he would call in a warning but he wouldn't ask for a doctor, its too out of character for him.
The jail is the perfect fall back for the Mallers, it would be the easiest and quickest building to secure. Duria's pride would never let him use the jail but Scratch is focused on what ever helps her achieve her goals. The remaining Mallers would hate but Scratch but know that she is their best hope for survival .
I think the Fort Irwin soldiers hit a booby trap that Tardust make and Puck was the only one not blown to bits. That kind of death would also probably be the most effective at shaking Michael up after his tours overseas.
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