I was in Victoria Station today at lunch time today. It was very busy with commuters and tourists so crowded and bustling. While walking through, I noticed a woman holding her c.8 year old son's wrist shouting at him in a Eastern European language (not sure which) it caught my attention because it was unusual. What happened next took my breath away. The woman, still with her son's wrist in her hand, slapped in on the side of the head, hard enough for me to hear the slap. The boy just shrugged which made me think he was used to it. I stood and watched not knowing if I should do or say something. I didn't know what to do; they seemed like tourists, didn't speak English, it was busy and it was awful but the boy seemed used to it. It was heartbreaking. I stood and watched but didn't do anything. Should I? What would you have done?