Wow. What did you do? Obviously you got off the water, but what did you do after that? Did you call the cops? Kock on wood, nothing like that has ever happened to me, but if I were in your shoes, I'd be inclined to hunt that guy down after I made it off the water...... They'd never find all of him, just a litle piece here and there.
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If you get home and I'm not there, don't eat it.