[Don't fight him, Edgeworth says, but everything in Sirius is straining to do exactly the opposite of that. Fight him, because there's no way this is going to end peacefully, with everyone going their separate ways. He hasn't got a choice. Not if he wants Edgeworth to come with him, not if he wants to get him out of here.
So even before the thing wearing the face of Edgeworth's father makes its move--Sirius was ready even before that, his wand in one hand and the fingers of his other hand curled into a fist. He doesn't look around at Edgeworth's plea, even if he feels some minor mark of success at having gotten him to come around at all--
And then the creature moves, its face ugly and twisted, and it looks so much less like it did mere seconds before--less like the face it was wearing and less like Edgeworth as well, and that makes it easier to try and get away from it--as its hands close around his throat, Sirius grabs for one wrist with one hand, jabs his wand toward the thing with a strangled shout--because what choice has he got, because in the moment, he only reacts, without thinking of what Edgeworth had just asked--don't fight him, but he has to get free--]
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So even before the thing wearing the face of Edgeworth's father makes its move--Sirius was ready even before that, his wand in one hand and the fingers of his other hand curled into a fist. He doesn't look around at Edgeworth's plea, even if he feels some minor mark of success at having gotten him to come around at all--
And then the creature moves, its face ugly and twisted, and it looks so much less like it did mere seconds before--less like the face it was wearing and less like Edgeworth as well, and that makes it easier to try and get away from it--as its hands close around his throat, Sirius grabs for one wrist with one hand, jabs his wand toward the thing with a strangled shout--because what choice has he got, because in the moment, he only reacts, without thinking of what Edgeworth had just asked--don't fight him, but he has to get free--]
Stupefy!