[CONT](Hand):If you have a vanguard with "Machining" in its card name, while you are paying the cost for Stride, this card may be discarded as a grade 3. [AUTO]:[Soul Blast (1)] When this card is discarded from hand for the cost of a G unit with "Machining" in its original card name for Stride, you may pay the cost. If you do, choose one of your opponent's rear-guards, and that unit cannot [Stand] during your opponent's next stand phase.