Making new friends rule
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The gentleman on the left has his own bottle, so I don't think two strangers just found wine and started sharing it.
Also looks more like a champagne bottle to me. (Which would also be easier to pop open without an opener than a wine bottle, I still remember trying to open a wine bottle with a stick)
Lots of wine comes with screw caps these days. The very high end ones don't, but in the low-to-mid range, it's not uncommon.
I also thought about that, might have been a screw bottle. But that bulky part on top looks like champagne to me, but of course I could be wrong