I question sometimes where to break scenes, especially in reference to the books. If this were D&D my answer would be simple, and I am tempted to use the same logic, however when you reference scenes against the events in White Night, especially at the climax, I start to question the scene breakdown.
I am trying to avoid spoilers here, so in the most general terms the climax is a pretty big fustercluck, as most DF books are by the end. Throughout I can count Harry throwing around way too many spells for his supposed stress tracks, unless when the chapters break the scenes break. In the literary structure the scenes are indeed breaking, but does it work in the game sense? Can you break a scene and wipe stress while all the rivals are still on stage? I could see it when Greycloak opens the portal for his superghouls, but even so...
In WN ending there are probably the following scenes;
1) Harry and Ramirez entering the Deeps till the duel begins. Social combat. The pause for scene change is where the bad guys go to "find the weapons".
2) The duel. Physical Combat. The pause for scene change is when the duel ends, the outcome is decided and the bad guy opens the gate.
3) The big battle. Physical Combat. The pause for scene change is after Harry opens the Gate and the Superghouls take time to eat the Malvoras. Minor combat still occurs here and there. The crippled Superghouls regenerate due to Mythic Recovery.
4) The Outsider Attack. Mental Combat. Scene change is when Harry and Lara survive the explosion.
It should be noted that even a minute or two to catch a breather signifies scene change combat-wise. Think of it like boxing; between one round and the next, the boxers catch their second wind and can go at it again (stress is cleared) but they are still suffering from especially nasty blows (consequences carry over)