Sure, it could be 2 scenes. Remember that a "scene" is simply an arbitrary unit of time, similar to white wolf's scenes, and is meant to designate something like "from tv commercial to tv commercial". Any heavy action show will almost always end up cutting in the middle of a battle, or right after a reveal (the monster got TALLER, oooooh), or wherever they are at that particular 8 minute mark. One "scene" was the events preceding the battle up until right before the "end boss", who warranted his own segment. Even one duel can be 2 scenes... just where ever the action naturally breaks (as in, they both fall through the floor to the lower level).
The game really plays like this, too... stress boxes come back between scenes (we see our hero thrown through windows, into trees, ect), but the consequences (the ubiquitous eye-brow scratch, the twisted ankle) remain. Ever notice how the hero should be way, way more beat up than he really is, but instead he's just got 2-3 really noticeable ouchies and some dirt smears?
In their explanation of why the game took forever, evil hat specifically mentions that spellcasting took a lot of work and playtesting to get right. Until I am really, really confident in my spell-fu, I think I will just opt for more scenes instead of adding house rules.