Disclaimer: Watched part of a Fate/Extra playthrough on YouTube and this idea randomly solidified during Kuzuki's first appearance in the prologue
Jacob Edmonton is living in a false reality.
He doesn't know how he knows this, or why he believes so fervently that the reality around him is false, but none the less every single atom in his body is scream- no *Howling* at him, spurning him on in a relentless pursuit for the truth consequences be damned, and he can't help but go forward and grasp that truth with all his might.
Strangely enough, he can't help but think that Cayde Six(whoever that is) would be absolutely laughing his ass off at his current plight.
Warlock Protagonist/Young Wolf winds up in the Fate/Extra timeline after a mishap involving the Infinite Forest and Worldline Zero, inadvertently replacing Hakuno Kishinami and temporarily losing his memories in the process.