The scene is a quick one, and viewers aren't able to tell if it is indeed Lohman or a stunt woman who got dragged. But if you slow down the scene and freeze one frame, you'd see that it's not Lohman doing the stunt but some other girl. It's obvious even with the face contorted on purpose (still warranted in the scene, of course) to avoid recognition. It's definitely a stunt woman who has a much longer face than Alison's.
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