Eternion battle level discrepancy?

So I decided to take a random look through the archives again today, and I ended up at the Eternion battle. At the beginning, when Karn makes his party, his level is clearly listed as 54, yet afterwards, when he's dead his level displays as 58, without the 'Level up!' next to it that Ardam got (Ardam got all the exp from that battle, I assume).

Maybe it was one of the Elder Scroll things, and he leveled up from leveling his main skills (In this case, slashing and more slashing, which he did a lot of with those three I-Storms).

G