This past Shabbos, I was walking with some friends for an aufruf in another part of town. Where we started from had an eiruv, and where we were going had an eiruv, but there was an area in between that did not have an eiruv. This area actually has a shot at being a reshus harabim, as it's a highway that has many cars driving through it on a regular basis (though I'd have to check if it actually is a reshus harabim).
While we were walking through the stretch that didn't have an eiruv, my friend's yarmulke blew off. I didn't tell him anything, but he picked it up and put it back on.
So now I'm wondering what actually should have been done. Since it might make a difference:
- What should have been done, assuming the highway was a Biblical reshus harabim (רשות הרבים דאורייתא)?
- What should have been done, assuming that the highway was not a רשות הרבים דאורייתא?