Sometimes a fighter will attempt a take down, struggle a while, fighting for position to do so. Then they'll be able to "pick up" a fighter briefly and bring them down, but ever so briefly and the other fighter pops right back up - barely being downed. Sometimes a fighter will drag a fighter down laterally causing the defending fighter to take a knee briefly before popping back up. Etc etc. My question is, at what point is a fighter "taken down"? Does it have to do with what part of the body touches the mat? Is it about duration? Does a "lift up slam down" motion count or does it always have to a a "clasp and drive to the mat" type of thing? Thanks for your comments.