I hear that was in SAO season II, which I did not watch. In fact, I hardly paid much heed to the finale of Alfheim Online
The second season of SAO was mostly boring to bad, but the last arc (that was like 4-5 episodes) was pretty decent. It had nice some nice action, and the main character was actually likable for once. And it actually somewhat delivered on the emotional moments (mostly due to the good performances). There's a few stupid things that happen, but not enough to take away from the whole arc unlike most of the show.