I don't suppose you noticed a circle running torpedo, by chance?
I had one attack with a couple of cargo ships. I sank one with two torps, missed the other with one torp, and one torp ran in a circle. I managed to get out of the way of the torpedo, and then watched as the cargo ship sailed right into the circling torpedo.
Maybe you had the same thing happen? Otherwise, I'll go with the "dropped a depth charge on himself" idea.
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