That does sound out of character for sure. I hope neither of us ever have one of "those", Evidently it happens alot in Mallard derived breeds I read it on here quite often.I have less experience than you but I did have that one guy and he was AWFUL.
I hope you never get one of THOSE drakes.
Everybody else, well we've talked, you know, I love them. But there was that one guy who was so out of character from everyone else.