what is a Yiquan? is this a onother form of martial art that have the same technique?
Yiquan is one of the Chinese internlal martial arts. And one of the things they like to practice is bouncing people away in a similar manner as Shioda, Tamura, etc. do.
But an ever better example than Yiquan would be a youtube video of Morihei Ueshiba, I mean, that guy really did know a thing or two about aikido!
(I'll search for the URL when I have some more time.) In this video he first has someone pushing against his leg (= static situation) and then he bounces him away.