Have any theories on Philip's choices there? It feels like his second message was personal to Philip as well (like I said, I imagined him hearing Henry saying it to him) so he spoke to the guy as himself too.

Of course, there was also the story from last season where he learned his father was a guard and thought that might have meant he was terrible (just like Philip) but that didn't seem right.

ETA: Seems that Harvest switched languages too, asking him if he remembered in English, so Philip was following his lead and answering him in the language in which he was being spoken.