The Doctor was kind of expecting that. He sidestepped, so that the blast only hit his toe. He hopped about for a moment, glaring at her, but his screwdriver never wavered.
"Lady Anat," he said, in as reasonable a tone as he could muster. "Let me warn you, there are a good many versions of myself about, as well as many versions of someone who'd have killed you by now, despite the potential danger to your timeline. Count yourself lucky you got me. Now please just put the weapon down and let's talk about this like civilised people, all right?"