I had a similar problem with the Cabrinha 2013 Switchblade IDS. When I flagged it out to the two front lines, it did not drop on it's back and pulled because the wind was getting stronger. Fortunately, I was standing, and when I was eventually standing in shallow enough water, I was able to move fast enough toward the kite to drop it on it's back.
This video shows the problem - where you have to move toward the kite faster than the kite is being blown away from you on the surface, to get it to drop on it's back. At 33 seconds he uses a trick to get the kite to drop on it's back - where he pulls in a short distance of centre line and when the kite lands on the surface, he releases the line immediately, which causes it to drop on it's back.
The original 2009 IDS on my Crossbow from my experience was a proper safety system designed to make the kite drop on it's back even if the kite was in the nose down position on the surface, but It seems the height of stupidity to me to manufacture an IDS type safety system that relies on the kite dropping on it's back that does not work when the customer needs it to.
I think the IDS system was a very good idea (because it has other advantages for launching and landing), but only if the leading edge shape and bridle configuration is designed to be a safety system first and foremost, and not compromised to get flight performance characteristics.
This works with a Cabrinha Switchblade IDS - I don't know if the Ocean Rodeo would do the same. It works the same if you set the IDS kite to the side of the window and pull the centre lines down to the Y instead of using the release. I avoid dropping a double front line flagging kite from overhead by setting the kite to the side of the window and pulling the centre lines down to the Y instead of using the release. - that means if the kite did somehow end up in the position you found yourself in, I can grab one of the front lines.