He's using his RCS thrusters and boost to turn faster.
Personally, I'd probably never turn FA on again, if we could only have a mode with heading hold, i.e. an FA Off mode where your nose stays where you leave it, rather than keep drifting until you reverse your previous input.
Sadly that was deliberately left out to make us fly with FA on for aesthetic reasons. I hope I can persuade tem to put in slight damping when your angular velocity is very low (like 1 degree / sec)