In the second Ami nods to the knight, he moves a foot around Kanda's leg to break his stance and holds him by his torso and arm, to forbid him from fighting. For a second, he expected the Priestess' patience to have worn thin and chose to execute him, but he listens.

And watches dispassionately the injury inflicted over the traitor.

It would not be mortal. At most, some thoracic muscles could have been damaged, but they would be enough to keep the guise high. Turning again to see Mercury, however, made him wonder if there was a lot more in her actions than a tactical need.

Only by her order would she release Kanda.