"It's rude to tell an assassin they're an idiot." Kasumi replied, the mirth dropping out of her voice as she spoke. Her facial expression hadn't changed, and the grin was still plastered on her face, but the two of them didn't know that. Taking the cue, Kasumi entered into her invisible state again - it was an imperfect disguise at the short range they were in, but she darted backwards quickly enough that she'd be able to slip from sight completely before either Chelle or Dom could react. Despite the short time that Shio and Kasumi had known one another, Shio knew of the Touho family and specifically of Kasumi's abilities, so the sudden disappearance would likely not have come as a shock to her - and she was not socially adept enough (or she simply did not care enough) to warn Chelle of what was likely to happen next.

Kasumi would be more than content to bide her time, stalking around the periphery of the square in order to reach Chelle without her noticing, but the situation called for a more immediate sense of action than that. With the dexterity and speed of a practiced killer, Kasumi darted around the outskirts of the sight radius through which she could be seen in order to get behind Chelle as quickly as possible, and using the opportunity created by the surprise of becoming invisible, she would poise herself to strike and pickpocket the young woman's PDA, before dismissing her invisibility.

"I could've killed you, you know." Kasumi dryly noted, keeping her gaze on Chelle while she studied the PDA. Based on the previous conversation, it would be no more than a few minutes before Chelle was seeing red, and maybe then Kasumi would give her a break. Maybe.