The pack had probably been stalking us since before we hit the city limits, gathering reinforcements from all over the county as they approached. Packs of infected get smarter and more dangerous the larger they become. Groups of four or less are barely a threat unless they can corner you, but a pack of twenty or more stands a good chance of breaching any barrier the uninfected try to put up. You get enough of the infected together and they’ll start displaying pack hunting techniques; they’ll start using actual tactics. It’s like the virus that’s taken them over starts to reason when it gets
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