I think the Third Magic may or may not apply, honestly. If people are being pulled from different timelines, isn't that just the operation of parallel worlds and time travel? The only point the Third Magic comes in is if something is spirit and spirit alone.

[Waver sits down across from Merlin warrily, putting some space between them. Besides being a mage, Merlin is also Merlin and that legend has a reputation.]

Let me complicate that second point for you. There are people here who have been pulled from point A. In dreams, they have lived through new experiences in seeming real time, let's call that point B, so that it's as if they've been gone for a night or two of sleep here, but their memories represent a different gap in time all together. [Canon updates. He means canon updates.] How does that factor into the system you know of?