[Isabela has the type of abilities that can lend themselves well to this kind of scenario - the ability to disappear for a time on the battlefield, the ability to perceive what her enemy's attack will next be in order to dodge it effectively.
And it works just as well to protect otherwise, although she'll pretend this is entirely coincidence that she appears, quite suddenly, behind Freya in order to stab both her daggers into a creature on the verge of attacking her while her back is turned. It just so happens that she was passing by - not that she's actually, genuinely concerned about her.
Regardless, it's a sudden burst of a woman right there and stabbing something and then covered in blood. So, you know, a typical non-Kiseki day for her, really. Hi.]