Ok, so while this is undoubtedly quite entertaining, I feel compelled to point out two things about T4.
First, I'm not sure how you missed the ENORMOUS SkyPriority signage and separate check-in area.
Second, most domestic flights (any flight number starting with a 2, in fact) fly out of T2. There's signage to that effect when entering the airport. I imagine you'd have had less of a hassle and no need for a bus if you had just checked in at T2 in the first place.