Now, considering the tenor of their relationship so far, Tony is kinda thrown by the underlying concern that has to exist in Howard, somewhere, for a suggestion like this to come up.

He rubs a hand across the nape of his neck, mussing the hair line.

"Fail-safes I've got." Not that they're actually always fail safe. "There's an auxiliary power system that kicks in if there's enough stress on the reactor. If you'd like to have a look at it, be my guest."