The best Cassie could manage in response to Steve's resolve was a disgusted and petulant click of her tongue. Tony's suggestion was probably logical but it didn't get her any closer to her goal and Steve was clearly not going to listen to reason. The only option here was, of course, to escape. The only forewarning of her intended treachery was a quirked eyebrow and the start of a smirk, and then she was shrinking. As if anyone could stop her! She was a Young Avenger! She was Stature! She was the daughter of Scott Lang and- suddenly, she wasn't shrinking anymore and felt herself rushing upwards, a bug-sized girl pinched between two ginormous fingers. In the last moment she had apparently become the Irredeemable Antgirl.