Fear isn't the desire to avoid death or pain. Fear is rooted in the knowledge that what you recognize as yourself can cease to exist. Fear is existential.

Harvey lived for this sort of shit.
His chief worry as they approached the science station was that Lieutenant Sagan would do one of her patented thoughtful, methodical approaches; something sneaky that would require him to tiptoe around like a goddamn spy or something. He hated that crap. Harvey knew what he was and what he was best at: He was a noisy son of a bitch and he was good at making things fall down and go boom. In his few introspective moments, Harvey wondered if his progie, the guy he was mostly made from, hadn’t been something really antisocial, like a pyromaniac or a professional wrestler, or maybe had done time for assault. Whoever or whatever he was, Harvey would have been happy to give him a nice big smack on the lips. Harvey was absolutely at peace with his inner nature, in the sort of way that Zen Buddhist monks could only dream about. And so when Sagan told him his job was to draw attention to himself so she and Seaborg could do their jobs, Harvey did a little dance on the inside. He could definitely draw attention to himself. The question was how.