Who cares about size? If someone is getting stabbed and there are 37 passengers, size doesn't matter. I like the old saying Tuco used on
The Good the Bad and the Ugly "I like big tall fat men like you.........you make more noise when you fall". Size has never worried me, more of a challenge and in a situation like this I would have done something and although I have never helped someone being stabbed I've intervened with public matters before. A lady being hit by her boyfriend who, lets say wasn't the happiest guy in the world. I was pumped and on a rush but wasn't go to let this prick hit a woman, not while I'm around.
My conscience and pride would never let me down, those wounds don't heel, I would have kicked myself to hear the lady had been killed on the street. Teeth, broken nose, eyes can all be fixed by time. A few other examples come to mind. If the guy was standing over the guy stabbing him it's easier. It's not like the guy was facing them wife a knife encouraging them to come on have a go. That's different. Oh well, end of the day some poor guy was killed. Thoughts and prayers to his family. Our world is full of sick people. Bring back public execution..............