Ratchet knows better to expect any different. (But that wouldn't keep the medic from scolding him.)

There's a few more reactions, but only in terms of grimaces; they're better than other faces he can make. And he's clenching his jaw tightly as she pushes it in further- yes, there's discomfort, but more, the rush of air through all those parts, sucking up the loose debris?

He'll be glad when this is over.