He started thinking about what drugs could do this. His mind was trying to list out the drugs that could do this to him and create the reactions he saw in Jack. Emphasizing natural inclinations? The Doctor was excited to be safe, so he was euphoric, a little frustrated by his predicament against the wall, now he was furious...

"That's what I said, isn't it?" the Doctor snapped. Jack could just be so utterly useless. Repeating what the Doctor had already knew, only interested in having sex with him. That was all Jack was ever interested in!

He couldn't control himself, the Doctor pulled back and threw a punch at Jack's face.