Just Try :)

robot.js

//FightCode can only understand your robot
//if its class is called Robot
var Robot = function(robot) {

};

var should_rotate = true;

Robot.prototype.onIdle = function(ev) {
    var robot = ev.robot;
  if (should_rotate) {
    robot.ahead(1);
    robot.rotateCannon(1);
    robot.turn(1);
  }

};

Robot.prototype.onScannedRobot = function(ev) {
    var robot = ev.robot;
    var other_robot = ev.scannedRobot;
  should_rotate = false;
  robot.rotateCannon(2);
    robot.fire(1);
  robot.rotateCannon(2);
    robot.fire(1);
  robot.rotateCannon(2);
    robot.fire(1);
  robot.rotateCannon(-2);
    robot.fire(1);
  robot.rotateCannon(-2);
    robot.fire(1);
  robot.rotateCannon(-2);
    robot.fire(1);
  setTimeout(function() {
  should_rotate = true;
  },100);
  
};