Whatever face Tenenbaum is making, Sinclair definitely smiles. A small one, but there's no mistaking it. Apparently Jack has a reputation.

He lets them walk the rest of the way in silence, partly because he's got nothing to say and partly because he would rather not attract any more attention than absolutely necessary.

Once they get to his door, he motions for Tenenbaum to wait a moment while he goes in and adjusts his turrets to let her pass, and then reappears to motion her inside.

"I've got a study in the back, we should be able to talk there without disturbing him," he tells her.