Honestly, I was waiting to see a thread about this as I saw her typing away afterward! I will presume for now she was not a mner or that she just had better things to communicate about.
I take the same train everyday. I sat next to someone I had seen before but we have never exchanged any pleasantries, it's a commuter train on a busy line. She sneezed and proceeded to seem to struggle with lots of sniffing and nose wipes with furtive clothing touches after.
I've thought about this before. If I was ever in that situation I would be very grateful if someone offered me a tissue.
So, I offered her a tissue.
She did not want it. All fine. But of course I sat there neurotically pretending that what had just happened was perfectly normal. It wasn't normal, was it? I crossed a social barrier that says we must ignore others at times like these???