[Doc gravitated to this particular panel like a parched camel to water. It'd been far too long since he'd allowed himself to indulge in discussion of time travel. It was dangerous, of course, but there were questions he longed to ask someone else familiar with the concept. He raises his hand.]

I absolutely understand the grave potential consequences rippling out from the smallest change, Doctor. We're in agreement there.

But is there ever a moral imperative to alter a timeline?