[She just barely keeps from walking into the sudden field, and the immediate urge to say "of course" herself, though much more dryly and resentfully, is extremely high... but she resists somehow. Instead she crosses her arms and takes a quick half moment before speaking up to him flatly, still turned away]
--Have you already gone through this?
[Not having to explain means less opportunity for her to completely lose her composure, and if he knows the drill then he should want to get this over with so they can get the hell away from each other as fast as possible]