He does smile, although there's a hint of sadness within it, "I'll do my best. I don't like to be discouraging, anyway." He gives her hand a squeeze, "Donna was caught by that sea beastie, but luckily she's pulled through. I can't speak to the others, though."

After pulling Donna to shore and unable to find Wallie's body, the Doctor wasn't sure what next should be done.