Hello!
please comment this video( from 1:23)
I talked to Master Kim and he asked to answer about this video.
The practicians who has weak body and blocked enerhy channels such effect can appear when tabjeon energy increases. It looks like water hose effect - when tap is opened anв water starts to flow too fast the tap twists. For practicioners, who feels such effect Master Kim advices the following: when "trembles" appeares try to direct your mind and will for saving body in motionless condition.