[Well, immovable as in very, very difficult to do so without hurting him, of course- which she's becoming less concerned about the more he tries to slam into her.]

Because I'm famously bad at it and despite this--

[She twists under his grasp and lets him fall to the ground to just. Sit on his back.]

I still want you not to die. And if we gotta do this here, I guess we gotta.