Ever thought they may be popping a heavy synth or changing a load out for the event boss? I personally don't stand out in the open during a firefight with the wolves and get into my menu. If the mini boss is there and you die, no chest for you.
Just offering a different perspective as I do hide for a second to pop synth.
Edit: I do my work, not just enough to get paid
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This is a totally reasonable assumption, it's something I try to do on the fly also. The incidents I'm talking about had players hiding for multiple waves and not doing anything. I don't believe they were popping ammo synth. Thanks for the different prospective.