On 9/2/2022 at 9:19 PM, Red Eagle said:

Problem: We are told in Chapter 6 of Lord of Chaos that, "Holding the Power prevents one from being subjected to Compulsion."

 

The WoT Wiki cites a number of additional places where this "fact" is reiterated. 

The simple solution to the problem is that we are never told any such thing.  The words quoted do not appear in the books.

The relevant quote appears to be from Sammael's perspective, as he thinks of Graendal (LOC Ch 6):

Quote

She used Compulsion so often like a hammer that one might forget that she could wield the weaker forms of it with great delicacy, twisting a mind's path so subtly that even the closest examination might miss every trace of her. In fact, she might have been the best at that who ever lived.

 

He let the gateway vanish but held on to saidin; her tricks would not work on a man wrapped in the Source. ... There was no way she could know he still grasped saidin, but she smiled briefly into her goblet as if she did.

All that tells us is that Sammael believed that Graendal's "tricks" — which might have been the "weaker forms" she wields with "great delicacy" — "would not work" on him while he holds saidin. Whether that is interpreted as a narrow statement of Sammael's belief about his own capacity to resist Graendal's "tricks" in the particular circumstances, or as a broad and absolute proposition about all saidin-holding channellers resisting all forms of compulsion in all circumstances, it does not say anything about Elayne's capacity to resist Moghedien's compulsion.

What the Forsaken think also cannot be taken as gospel in any event, as shown by Sammael's ignorance in the last sentence. He believed there was "no way" Graendal could know he still grasped saidin, but of course there are ter'angreal that enable a female channeler to do just that, including the one possessed by Nynaeve (ring set with a pale green stone, KOD Ch 27). Nacelle Sedai even demonstrated a new weave of saidar by which she was able to detect Narishma holding saidin (KOD Ch 23).

Returning to the original quote, later in the same book, we get Graendal's perspective when she visits Sammael (LOC Ch 23):

Quote

Sammael must have had the promise[of Nae'blis from the Great Lord]. If he died now. . . . He was certainly holding saidin—he would be mad to say these things otherwise—and he would feel the instant she embraced saidar. She would be the one to die. He must have had it.

It may simply be that Sammael believed Graendal's "tricks" would not work against him while he grasped saidin because he knew he would feel the instant she embraced saidar, and he knew she knew that too.

You're right, it was related to the Bowl of the Winds.

There's a good explanation in the FAQ: http://wotfaq.dragonmount.com/node/103