Ensemble Studio Theatre is kicking off its 35th Marathon of One-Act Plays this week with Series A. The Hell’s Kitchen hub is, as always, chock-a-block with emerging and established talent. I met with the six writers of the first leg right on the cusp of opening night to talk a bit about child prodigies, Rockettes, East Africa, gunshot sound waves and the perils of being a bit too honest when splitting cab fare.…