Holden would swear that under any normal circumstances, he would not be able to hear a knock on the airlock door while in a different part of the Rocinante. He suspects that there's some sort of magical amplification going on.

When he gets to the airlock -- which dwarfs most of the cabin doors along the hallway, to his great and mostly-unremarked amusement -- he hits the button to open it, and then wonders, for several seconds, if she has the wrong door. Though, how could she? It's distinctive.

Oh, right. Jedao's interference. That makes more sense.

"Uh, yeah, sure." He steps aside, though there's enough room that it's really not necessary. "Wait, hang on -- watch your step, it's still low gravity in here. Want me to turn it up?"