I think you guys got the message wrong. The helicopter will have a very good chance of flipping over due to the moment created by the undercarriage if it is bolted down. However, I do agree with you all(in fact it is in the check list) that the gears MUST be down after ditching. I am involved in water sports and over the water even 20 knots is a lot of speed.The water feels like concrete at 20 knots.