A shared enemy pounding on the doors could make allies out of disagreements.

"There are many outside," Regulus pointed out, "And we have thin walls and failing magic between us and them." His skepticism always right there on the surface, though he'd never considered the possibility he'd have doubts about magic.

"Does faith stretch that large?" It wasn't entirely a dig, Regulus knew nothing about faith or trust. Only here had he started to learn anything about either.