I watched these Swifts for ages and they appear to be mating on the wing,tricky business.
No interactions present.
Something about the long, pointed wing in the second picture says Common Swift, but these are very tricky to tell apart. I can't get enough detail on the pics, when blown up, to see any scaling or eye patch...etc to be certain of Pallid. You may well be right, but I find it hard to agree.
My Flickr photos...
The only reason I thought Pallid rather than Common was the size ,there were larger birds flying with them.
Size is very similar and certainly they can overlap, so it is not a useful criterion. If there were noticeably bigger birds with them, those may have been Alpine Swifts?
Alpine Swift is huge and with a very noticable white patches - Pallid Swifts are really hard to pick out and although I|'m not entirely certain I'd be inclined to think the birds pictured are Common Swift
Lat/Lng: 41.2758, 1.9136