River looks pointedly innocent at the mention of the TARDIS, and shifts her diary a little to tuck it under her arm. If Jack hasn't noticed it yet...

"Time travel is actually a more valid explanation than you think," she says to the boy with a smile, eying the... weapon of his with a bit of interest. "I'm still keeping the gun."

The talking mole rat got a surprised blink out of her, but she's from the 51st century, and used to sapient nonhumans. Though usually not in that particular shape. "Hello."