[FourPeas]

According to his father, Hensley was a good swimmer,

Swans can be NASTY. Years ago there was a case of swans drowning a jet-ski rider. I'd guess under similar circumstances when he got too close to a nest.

[cynwoody]

Years ago there was a case of swans drowning a jet-ski rider.

Or the reverse.

http://www.battlecreekenquirer.com/VideoNetwork/973797106001/Jet-ski-rider-accused-of-killing-swan