Tracker lock

onRobotScanned: function(enemy) {        
    var angle = enemy.bearing - this.gunBearing
    angle = angle < -180 ? 360 + angle : angle

    this.turnGunRight(angle)

    this.state = 'lock'
    if(Math.abs(angle) <= 1 && this.energy > 10) {
        this.fire(enemy.velocity < 1 ? 4 : 1) 
    }
}