My mother the crimefighter

I’m pretty sure my mother foiled a theft on Saturday. We were passing La Senza and saw a woman drop something as she walked out. I saw her male companion spot it and assumed he’d pick it up, but he kept going. Mum moved faster than me, quickly turning and saying ‘excuse me’. The woman jumped sky-high as Mum indicated the garment on the floor, and stood frozen for a second as companion picked it up and took it back into the shop. Was most odd – we can’t think of a logical explanation for their reactions if she wasn’t stealing it.