The dedication Regina had for her cursed partner was motivation all on its own. Neal would have done the same though, for any of them - he knew what being saddled with that curse was like, he knew how it changed you and how you were warring with the monsters in your own head.
"Don't worry, even if I fucked up with Excalibur, my god, I will keep your house intact," he vowed. "Good luck with moving the precious cargo - you need anything else, just call or text."