The water is calm, are not wearing a PFD of any kind, you slip and fall
overboard, hitting your head and knocking yourself out as you enter the
water. Your friend, also without a PFD, goes to save you, gets excited,
falls, hits his/her head as they go over. Two lumps of potential fish
food sink slowly but surely to the bottom.
Probable? No. Possible? Of course it is possible. The only remaining
question is: is there really a question here?

To me, yes, it was a legitimate question.
To some, apparently not. Fine.

Thanks for the replies.