Hans did recognize the distinctive thumping echo, or at least thought he did. He'd heard them, and seen the aftermath, far too often during his residency.<br/><br/>"That sounded like a car bomb going off. They happen in Los Angeles from time to time, but zey are never a good thing. I do not see ze infected having capability to employ such veapons, though, so the question becomes of who did, and vhy?"