Christine has already come, she definitely won't turn back easily, so Roland took the opportunity to invite her to join them. Sif didn't care either way, but Angelina was absolutely unwilling.
She knew very well that Sofia had already offended the Goddess of Light irreversibly, and Christine was the most loyal follower of the Goddess of Light in the human world. How could she not be worried?
Having Christine join does have its advantages, at least the team won't have to grope forward in the dark.
Although this kind of candle-light-in-the-dark behavior is somewhat ostentatious, Roland did not oppose it. What they needed to do was to protect Sofia, be it scaring off or killing the enemy.
Christine's summoning of light to illuminate the night and deter the enemies indeed saves a lot of trouble.
The light surrounding everyone was not strong, yet very clear, guiding the direction forward.
