Now I suspect that the two guys who had beaten Mr. Shrestha to death, probably did not escape, but they were also killed, and their dead bodies also thrown in Narayani river. Prachanda must have directed this way to eliminate all evidence. I don't think these killers are alive. Only the naike of the killers i.e. Prachanda is alive. I am sure that Prachanda ordered to clean the mess, and fabricated the story.