Has anyone ever done this? I went to no-gi last night and our instructor says he has a surprise for all of us and we're all thinking WTF could he be talking about and he goes to the back room and turns out all of the lights and says, "Alright now it's time to roll." I was thinking it was a joke or something like that, but he was serious and we did this for about 20 minutes. I thought it would be almost impossible to do anything, but it was a lot easier than I thought, the whole idea behind it is to use your feeling to roll. It was pretty cool and it was certainly something different.