[Chekov sure did put his foot in his mouth there. It's extremely rude to dismiss someone's career as insanity and he's appropriately embarrassed.] Ah--sorry. Of course it would be necessary to take action in such situations.
How is time travel achieved in your universe? How do you minimize the risk of unintentionally altering timelines yourself? [As a physicist from a universe where time travel is not terribly well-understood by virtue of being too hazardous to test extensively, he's sincerely interested.]