She recognized the feel of being analyzed as a potential threat. It was something she herself had done countless times in the past. Seconds passed that felt like hours. Nearing the end of her fifties, by Hermione's estimation, the woman looked to be the kind of person that wasn't afraid of much. That could be a good thing or a very, very bad thing. If she didn't believe Hermione was a threat, she might let her go with little more than an apology. If she did believe she was a threat, it was likely Hermione wouldn't even know it until it was too late to get out of there safely. Dealing with humans capable of thinking for themselves meant dealing with unknown variables.