"Gods intervene directly in Golarion only very rarely. This, if it's an intervention - just doesn't seem very much like anything I've heard attributed to any god who's immediately coming to mind, not just in terms of goals, but methods. I've never heard of a god just slapping a persistent antimagical field on somebody, with no obvious purpose to it, and not, sending anyone a vision telling them to do something. Gods can most easily act in ways that - reflect their natures - and I cannot think offhand of any god whose nature easily matches to throwing shells of antimagic around people. If they did that anyways, it would be madly, insanely expensive to them, for an effect as powerful as this one."
"For that matter, I wouldn't expect Asmodeus to be especially happy about some other god doing this in Cheliax without his permission; it is something gods would usually negotiate among themselves first."
"That there is no obvious explanation on Golarion side's is why I asked you sooner rather than later about dath ilan's side, even though you apparently had no magic there."
"It is very expensive for Asmodeus or Heaven to send us information or commands, and they will not do so only for our having asked it. Else we would have done that at once and earlier."