Perhaps it would seem like i don't care. I would have thought so if i put myself in the shoes of a passer-by. But i know i can't do anything to help. So i would often stand aside and look from afar, silently and helplessly; and maybe pretending that i see nothing, know nothing. Simple regards like "are-u-ok?", "what-happened?" perhaps can show your affections but it's not going to help in the situation and they ain't coming out of my mouth. I don't want to be a nuisance.