"Well, I solemnly swear not to let you hamstring me during lessons that can't be moved around," he told her, keeping the solemn tone as required, and even going so far as to place a hand over his heart; never mind that she couldn't see it.
Never mind, in fact, that the gesture made him remember her making a similar gesture, albeit with a closed fist instead of an open palm, and against a teenaged girl's ill-fitting chest plate. He drew his hand away quickly, trying to take the image with it, that he wouldn't have to be distracted from the end of his phone call.