I wandered around Tesco in a bit of a daze. Certainly I didn't feel ill then (I was off work today with flu-like symptoms), but now I feel like crap.
I drove back past where the incident happened and saw a police van and car, so hopefully they called the police.
I always thought I'd be too scared to help in that sort of situation. I'm glad I wasn't, but also I'm glad they didn't have knives and didn't turn on me instead. I think I may have rationalised that if they'd had knives they would have been using them on the couple but that didn't seem to be the case.. well it made sense at the time. Perhaps that's a dangerous assumption.
I have a feeling I'm going to be reflecting on this for some time.