So, what is the pont of the battle with Calder?

[Kamunami]

-Calder will become victim to the snarl to show its effects in action.

I actually really like this specific possibility, in addition to what everyone's saying. Though I'm guessing by the Snarl you meant the "Threads of Creation" we saw earlier? No one's going to go touching them willingly, but this fight makes the perfect opportunity for someone on either side to end up accidentally grazing one and show us how dangerous they really are.