Drop rates in XI were ridiculous... Oh, the memories.
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I always write that sort of thing off as a side effect of battle. You don't get two Bat Wings from every bat because some get broken during the fight. You don't get a skin from every goat because some are destroyed beyond use, etc.
This thread reminds me of this gem of a video...
https://www.youtube.com/watch?v=8lZlQNsbmeE
Too relatable.