Great, thanks Scott! Re-reading the rule book entry, that's exactly how it's worded as it doesn't use the word 'enemy'. I guess I was also looking at it from the wrong angle in that I was thinking the opponents roll was them actively resisting the copying, when actually it represents powerful abilities being harder to copy, which makes sense no matter who it is.
Thanks again! I'm busily repainting Heroclix figs to have my first game soon :-)