This is a fun little cheap using Spiral’s projectile assist.
From close range call Spiral’s assist, then immediately grab them with Son Son’s HP grab. Spiral’s knives will hit even though you’ve grabbed them. Hesitate a split-second, call the assist, and grab them again. Repeat until they wise up, then punish them with a combo as they try to counter.
Combine this cheap with her runaway and corner trap patterns to bring Son Son a step closer to the top.
edit: as per usual-- my bleery-eyed training session led me to neglect the fact that all you have to do is roll out!