Mine

 private void TimerBullet_Tick(object sender, EventArgs e)
        {
            List<Bullet> bulletToRemove = new List<Bullet>();
            foreach (Bullet b in bulletList)
            {
                bool collisionBulletGround = MapOpertations.CheckCollisionBulletGround(b.getRectangleCon(MapOpertations.mapSize, MapOpertations.fileMapSize), map);
                if (collisionBulletGround || CheckCollisionBulletUnit(b))
                {
                    if (collisionBulletGround)
                    {
                        int i = 0;
                        foreach (Unit u in unitList) {
                            if (b.InMove==0)
                            {                 
                                int rad = w.getRealBumPower() / 2;
                                float dist = DistanceSquared(u.Position, b.Position);
                                if (dist < rad * rad)
                                {
                                    u.HurtInTurn = true;
                                   // u.Health = u.Health - (int)(Math.Sqrt(dist) * w.getBumPower() / 2);
                                    u.Health = u.Health - w.getRealBumPower();
                                    if (u.Health < 0) u.Health = 0;
                                    this.Text = this.Text + "Unit" + i + ": -" + dist;
                                    UpdatePlayersHealth();
                                }
                                //u.Health = u.Health - w.getBumPower();
                                //MessageBox.Show("Unit " + u.Health);
                                //Console.Write("unit "+u.ToString());
                                Console.Write("\n\nposUnit [" + u.Position.X + "." + u.Position.Y + "]");
                                Console.Write("posBullet [" + b.Position.X + "." + b.Position.Y + "]");
                                Console.Write("dist [" + Math.Sqrt(dist) + "]");
                                Console.Write("rad [" + rad + "]");
                            }
                            i++;
                        }   
                    }

                    BulletLoop();
                    if (b.InMove == 3)
                    {
                        map = MapOpertations.ExplosionGround(map, b, w);
                        bulletToRemove.Add(b);
                    }
                    else {
                        b.InMove++;
                    }
                }
                else if (b.Position.X > MapOpertations.mapSize.X || b.Position.X < 0 || b.Position.Y > MapOpertations.mapSize.Y || b.Position.Y <
                    -500)
                {
                    bulletToRemove.Add(b);
                }
                else
                {
                    b.Time = b.Time + (float)0.1;
                    BulletLoop();
                }
            }
            foreach (Bullet b in bulletToRemove)
                bulletList.Remove(b);
            bulletToRemove.Clear();

            if (bulletList.Count == 0)
            {
                timerBullet.Enabled = false;
                timeShootingKeyPressed = 0;
                bulletLabel.Text = "....";
                speedLabel.Text = "....";
                nowLabel.Text = turn.ToString();
                if (checkStateOfGame() != 2) return;
                resetHurts();
                
                if (turn == Player.Computer)
                {
                    RepaintMap();
                    ComputerMove();
                }
                if (turn == Player.Computer)
                    turn = Player.Human;

            }
            RepaintMap();
            mapPictureBox.Invalidate();
        }