Jayden gives a faint hint of a smile at Blake's comment about not being sure he's that brave, because Jayden certainly wouldn't put it that way. It's probably more accurate to say that Blake is simply being reasonably cautious, something that is entirely warranted all on its own, let alone after everything that had just happened to them. It's completely understandable that he might not be as reckless--or perhaps, more accurately, desperate--as Jayden had been in making his own decision to try to access the Horizon, despite his own original concerns.

So although it seems like Blake's considering the whole thing, Jayden's expecting him to still be unsure, to have more questions or to want time to weigh his options further. But it seems that isn't the case, and despite the incredibly awkward--not that Jayden has room to judge, as it's certainly not rare that he's this awkward himself--way it's asked, it feels genuine this time, not an acquiescence to perceived pressure or something of that sort. So the nervous bouncing of his knee stills, at least for the moment, as he focuses more on the conversation.

"Yeah, of course. Whenever you're ready to, just let me know." He isn't sure if Blake meant now or later, but either way is fine with Jayden. Not like he has anything better to be doing, even if he weren't stuck recovering in a makeshift hospital for the moment.