I've seen mantids drop half eaten food a million times. It is quite normal.Probably something about the moth. A mantid generally doesn't drop something it will hunt for.
Don't worry too much about it... it happens. In fact just yesterday one of my mantids did the same with a moth. I have never tried feeding any of my mantids that type of moth before (it was small and black). I found it laying eggs on my grapevine out back, and thought it would be a good meal for one of my males that I hadn’t fed in a while.It wasn't too huge, but it was really fuzzy and pitch black. I never saw one before in my area...
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