By bne IntelliNews Initially, Anton and his friends thought it was a drone strike. The first images they saw on Telegram channels was of the top of the concert hall on fire, with black smoke billowing out into the light-polluted sky. Anton lives in Pavshinskaya Poyma, a district on the west bank of the Moscow River. On the east bank, a short five-minute walk away via footbridge, there is the Vegas Crocus City shopping mall, and, adjoining it, Crocus City concert hall, which was the site of Russia’s worst terrorist attack in two decades on the evening of March 22, when gunmen massacred concertg…