They've gotta eat somehow though, there's probably a reason the biblical angels said "Do not fear me" or some shit like that.
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But fr, I'm sorry about your coworker and that the new safety measures are useless. People should train their angels better from the get go.
I think that angel attacks might be kind of inevitable in the delivery world, personally I've gotten along with every angel that I've come across but sooner or later an angel is going to do something bad. You can do everything you can to prevent it but the numbers are against you.
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But fr, I'm sorry about your coworker and that the new safety measures are useless. People should train their angels better from the get go.