Gamers: You have to kill 20 of something, but you can only find 5. Do you feel guilty killing the same 5 over and over when they respawn?

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I guess if you kill the same 5 over and over, there's only 5 families of NPCs weeping instead of 20!
Gamers: You have to kill 20 of something, but you can only find 5. Do you feel guilty killing the same 5 over and over when they respawn?
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