Sam, while you might have just been trying to deflect Pinoko's question, it doesn't work quite the way you were probably going for. Something in the tiny girl's face just breaks and she bursts into tears. Whether they are sad tears or angry tears (or some combination of both) is hard to say right now.

"Pinoko will never stop worrying about her friends or the Doctor! I can't forget about them! What if we never get back? What if it takes us so long that by the time we get back, all of the people we care about are... are..." Those are more tears. She can't even finish that thought.

And then she hugs Sam. Well... she hugs his legs. Mostly because she is still crying.