"I hope so. I do hope that, Su."

There's little enough he can offer to his son right now in way of assistance. All he can do is attempt to be cheerful and positive, to keep from antagonizing the Knight and to assure Rilian that everything will turn out well in the end. It has to, else all of Narnia, along with his son, will be lost.

He holds onto her, hot tears slowly leaking from between his lashes, comforted at least in the knowledge that he has her here with him in this horrible moment.