In the Shadow of the Relic - alternate fight outcome? (spoilers)

[GrailQuest]

Do the inferi just keep respawning until you clear Solomon?
Seemed that way and I thought it was really just dumb. Basically it means Solomon was trying to kill me and Sebastian if he ignored the Inferi first.
What did he think he'd do? Render us unconscious first so the Inferi can kill us while we're helpless?

[Harris]

Yup, Solomon dies no matter what.