After Dinesh put this one on iNaturalist, Jacques@iNat suggested that it agrees better with Juncus duthiei which is endemic to the Himalayas. The part where Dinesh's flower did not agree well with Juncus compressus was that the tepals are supposed to be blunt in Juncus compressus whereas they are pointed in Dinesh's flowers. Since the species is very variable, I assumed it as variation. In Juncus duthiei the tepals are reddish-brown to blackish, sometimes with paler tips and greenish midribs, narrowly
lanceshaped, the inner narrower than the outer and with narrow membranous margins, all gradually
tapered to pointed tip. This is an excellent agreement with Dinesh's flowers.