The thing is, at the exhausted point Four had reached at the point she came along, I could seriously seem him getting humorlessly ENRAGED. And there's a difference between the forceful that his other girls were and the downright difficult that Tegan could be. I mean, even at the beginning with Romana, he nearly threw stuff at her in a fit.

I just saw Mark of the Rani, and there was a wonderful comfort level between Six and the Master while they were conversing amongst themselves while the Rani went to get Peri, but it still doesn't hit the level he had with Five. It blows the mind.

ETA: OH, AND. The Phil/Helen/David commentary was adorable. XD But Peter was on another of the commentaries, and I hear he's great for those. Everything I've ever heard him say has certainly been awesome. So that's one to seek out, I should think.