I used it 3 years ago, slower than the 2 above, control not bad, especially short game, but fh bh swap it's slower then above 2 also, defense very stable. Powerful shot and spinning loop, lack of speed.
Straightforward under the ball and lift the ball make it under spin, something like chop, but blade head forward to hit the ball then lift it. Very fun tho, I remember xu xin did this in some matches.
You don't have to say sorry, your reply just show me you don't know how to generate the underside spin with the topside spin movement, in table tennis we call fake movement , but I don't think you know how to read server at all.