The Doctor didn't like guns and well, Clara wasn't usually a big fan of them. But sometimes there were just situations where you had no real other choice. Like here. Especially since she knew that the Stormtroopers would be gone by the end of the day. Perhaps that helped to make it easier to deal with. Justification and the like was, well, sometimes the only way to survive in this place.
Or the whole stuck between one heartbeat and the last gave her a different perspective and essential immortality meant that she knew there would be times she would do something she would have balked at before Orange County but Orange County had a way of changing a person for better or for worse.
Thank goodness for so much time in the TARDIS that the language translator essentially was permanent so she recognized the signing. Unfortunately she knew that British Sign Language was different from American Sign Language so she wasn't sure how well she could come across, though she could still try? Nodding some, she gave a smile.
"I don't think it's in anyone's plans for the most part."