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Converted ECs only keep their SA if the SA does not target a hero. I am guessing that Nero's SA saying "immune to lone heroes" does actually target heroes (lone ones anyway), and therefore fizzles. I could be wrong, but that is how I would rule it.
It's not "harm," it's "target," since harm only comes from the opposite alignment so if that were the case ALL Evil SA's would convert.
That doesn't work either, since almost all Evil Abilities I can think of that aren't banding harm Heroes.
In a side battle no one is "attacking" or "blocking." They are just battling.
I still say that SAs of converted ECs cannot target heroes....
I still say that SAs of converted ECs cannot target heroes, since the "Current REG" definition of not harming heroes is false. According to the defintion of harm, no converted EC would ever harm a hero since they are of the same alignment.However, until there is definitive clarification on converted EC SAs, the Professor's assessment will suffice. The side battle has two heroes in it, so neither hero is alone.
I think the reason the ability does NOT convert is that in the definition of immunity, a character cannot be immune to its own alignment.