My last post was coincidentally about washing too - obviously I spend way too much time with laundry on the brain 

It's a lovely warm day so I've got my bedding happily hanging out the back on our communal washing lines. My upstairs neighbour has decided to do the same and went out with his sheets about 2 hours after me, but it's quite windy and I saw him struggling to hang them (first time I've seen him at the line in the 3 months I've lived here - maybe his first time hanging washing out?)
Eventually he got them all secured and went back inside, but in the past half hour his sheet has fallen off completely and is lying in a heap on the grass. I know this is so ridiculous and I shouldn't waste energy thinking about it but I cannot stop thinking about that sheet! Ha! I've only met him a couple of times in the hallway and never exchanged more than a "hello" so I don't know if touching his laundry is crossing a boundary.
WWYD? Half of me wants to be neighbourly and pin it back up for him but the other half tells me to stay out of it. I did this for a previous neighbour once before and was promptly told to "never touch her washing again" so I'm hesitant. Would you appreciate a neighbour picking up your fallen laundry?
A silly thread, but I appreciate any input!