This means the Doctor intercepts him for no actual reason a few times, at least early on. There's a metaphor in there about causing your own suffering.

Even through that, the skill and emotion on display are enough to keep his attention thoroughly hooked, which he wasn't expecting at all. Once his attention became - well, mostly undivided - it was easy to get lost in the sheer graceful rhythm of it.

This, of course, means he was entirely unprepared for the intermission and has to stuff a fist in his mouth to muffle the sounds he makes as his hips jerk uselessly.

"Oh, well, if they were more of a diversion." He's trying to sound properly scathing, but his voice barely has the strength, and he's sure Bashir could tell that his focus was equally diverted.