same motion for back spin - let the ball roll for top spin
it takes quite a bit to practice but it works!
Yes and also almost the same blade angle! I didnt realize it was possible to disguise reverse pendulum like this.
For me the major takeaway is to scoop it upwards. This makes the spin a lot stronger for the sideunderspin serve (i suspect if forward momentum was reduced it would actually be a ghost serve). Also the upwards movement can easily be used to generate sidetopspin. And this seems quite easy to keep short.
Previously i felt like hook serves were way better than reverse pendulum because I could do very different spins with same blade angle and movement, but this video kinda changed my mind.
Also, look at how Yuya just does a heavy chop dropshot casually off a heavy topspin ball served to him, that was crazy touch like Fang Bo. On another video he demonstrates how he adds heavy underspin to a short push which was super interesting which I only dared to do against sidetopspin, never against underspin (that extra brushing will just lead to me pushing to the base of the net). So apparently he also scoops the ball from underneath and rubs it hard upwards and to the right side to achieve this additional brush without netting the receive.