And Silver goes back inside and presumably communicates with his emperor.

(The first word out of his mouth is 'Sire' and Gregor just freezes. Miles makes heavy use of the phrase 'please humour me' over the following several minutes, but by the end of it Gregor has adjusted to the new paradigm and is omitting all names and namelike terms from everything he says. He requests proof, in a particularly imperial tone of voice, but allows that... Silver... can take his time producing same, under the circumstances. As predicted, he understands Miles's reaction perfectly.)

Some time later, he emerges from the house and checks on Promise.