I think TBC is certainly right. There is A LOT in that last scene. Sorry I am a scene behind - I meant to reply a few days ago but now I have the opportunity to consider both at once, where they do play into each other if I'm reading correctly.
This scene first... This de Cornellian (duke? prince of Toulouse??) seems to have Somerset's number. In a number of ways. And if I were losing an effort to convince a man to join an outnumbered cause as an ally I might have avoided pointing out that the Castilians are likely right behind their opponent...
But I gather -- if I'm reading correctly -- that King Richard was overconfident by degrees in blithely waving away concerns about losing Bordeaux?
Still, I don't see how Richard doesn't come back stronger and regain the lost territory, things going as they are.
Somerset would be wise to do as de Cornellian suggests. Sadly, I think he's maybe not so wise as he should be. And like his father far too loyal to the wrong people.
Rensslaer