It'd be wise not to, as it would only get a sober nod meant to convince Eileen that he had any bloody idea what she was talking about. It's been, shall we say, more years than Eileen has been alive since he took much in the way of science.

Actually, probably close to twice that long, but they won't think about that.

"I'll be careful enough that you don't go on any unexpected trips," he tells her with a grin, "but not so careful that it isn't fun."

That was a fine but important line, after all.