The Doctor turns his head up at the sound just like pretty much everyone else. His initial surprise and worry abates quickly when he realises it's just Daine, and a moment later he realises why exactly she was roaring. He grins up at her and waves back, then makes his way up the stairs towards them, figuring she was getting his attention for a reason.

As he walks up to him, he pushes his mask up and grins in greeting. "Well, that's a pony of a different colour," he comments cheerfully.