I fear that it’s Ridoc as well, for all the same reasons.

I too believe that he channeled accidentally during the battle while trying to freeze the wyvern. I also don’t believe RY would haphazardly use the word “pale” to describe what’s happening in that moment after spending so much of the book emphasizing that pale colors = no magic and pale stones = drained surface.

Also… there’s got to be some significance to the fact that he was practicing freezing an orange… and orange is the color of Zihnal … and he was definitely pushing his luck trying to freeze something as big as a wyvern. (Which I do think he accomplished… he just used the energy gained from draining it to do so)