Did this about 4 sessions ago. I am still a novice (into my second season) but I think my back foot was searching for the rear strap, way to late because I was motoring missed big gust (least that's what I am blaming ) ended up in the drink disorientated very winded with a sore head! Anyway was chatting to a bloke today who reckon I should put it up.
Lesson: Foot strap needs to be bigger and get in sooner... turned out a reasonably cheap lesson this time!