Magic and it's additional costs

[lastakodo]

I was relooking at the magic section when I noticed that any additional costs of spells appear to be required prior to the casting duel and after the final duel total.

on Pg 52 section 1 Declare a spell and Target.

"The Model declares the Spell it is casting, spends the required AP and meets any other requirements (such as discarding cards or suffering Dd or Wd)... if the caster cannot meet the Spell's additional requirements (if any), the Action fails."

BUT

on pg 53 section 2D. Caster Meets additional Requirements.

This says basically the same thing, meet the requirements or spell fails. The listed requirements are: caster suffering Wd, sacrificing/discarding Counters or Soulstones, sacrificing/killing friendly models (or the casting model), or other requirements indicated..."

Given the examples are fairly clear in that they don't overlap, except the Wds.

When do you have to meet the additional costs? Is there a way to determine which has to be done when?

[Rathnard]

I'd suspect that the reference to meeting additional requirements on pg 52 is an oversight, and should have been deleted.

The section on Pg 53, is much more detailed and much clearer, so I'd say that this part is where the additional requirements are supposed to be met.