I've seen this from wrestlers in MMA and I'm sure guys use it in BJJ/Sub wrestling. You have the closed guard. The top man postures up. You open your guard and instead of trying to sweep him, you come to your knees and get a takedown from the knees, usually it looks like a double or single from the knees. Does anyone do this? Is it a legit move? What are some common set-ups and takedowns from this position? Thanks.