"No blowing up the planet," Natasha says firmly.

She believes it.






It's not the truth, mind, because Natasha is perfectly willing to blow up a planet populated by under two dozen people to save a galaxy, but she'll believe it to give the lie sincerity.

"And we'll do everything we can to keep everyone else alive, too."

That, at least, is true without any further clarifications on the lying ability of spies.