The Slide
Before Florimel's kids go their separate ways after It Was A Lovely Little Breakfast, Sunni asks them what it felt like when Black Mask slid through them.
Out of character
This is really a GM question, I know, but it's also an opening if anyone wants to chat. And Sunni really does want to know.
They didn't really feel her slide "though" them, she was there, then she wasn't. More like a teleport with odd special effects than a phasing thing.
Gotcha!