public Collision Collision(Entity e)
        {
            float rad = (Radius + Radius) * (e.Radius + e.Radius);

            //Pos delta
            float px = X - e.X;
            float py = Y - e.Y;

            //Vel delta
            float vx = Vx - e.Vx;
            float vy = Vy - e.Vy;

            if (vx == 0 && vy == 0)
                return null;

            float a = (vx * vx) + (vy * vy);
            float b = ((vx * px) + (vy * py)) * 2;
            if (b >= 0)
                return null;

            float c = ((px * px) + (py * py)) - rad;

            float d = b * b - 4 * a * c;
            if (d < 0)
                return null;

            float t = (-b - (float) Math.Sqrt(d)) / (2 * a);

            if(t < 0)
                Console.Error.WriteLine("WTF THERE IS INFINITE LOOP STILL");

            return new Collision(this, e, t);
        }