Friend has posted on Facebook something along the lines of:
"Just seen a woman being grabbed violently by the arm by her boyfriend and dragged across crowded station whilst clearly upset. Hundreds of people were standing around doing nothing so I went up to them and asked the girl if she was ok and told her bf exactly what I thought of him"
Lots of responses from people saying well done, you did the right thing etc. AIBU to think that actually, intervening may not have been best? The girl is unlikely to tell a complete stranger she needed help, and it's likely that she's still going home with her OH who is now going to be even angrier and possibly lay into her for showing him up in public. It's not something I have any experience of at all. Any suggestions as to what an appropriate response would be?