If Clark focused his attention, he could identify that right now, Lois Lane's heartrate implies she's probably in the gym across the street from the Planet, the sound of each dual-thump elevated but steady. He could confirm that by tuning in specifically to hear the soft and consistent thump of her trainers hitting the tread, and music funnelled tinnily into her ears.

And when something happens, and doesn't something always happen, Clark doesn't have to focus his attention at all. So Bruce's comment gets a glance, and some silence.

The thoughtful kind, anyway, until he says, "And I guess the red lamp would make that possible," like thoughtful silence has also been used to figure out how that's meant to work, more than whether or not he's comfortable with it.