This is the sort of chapter that makes me wonder what the point of any of this is. We just saw lancelot one shot two induras with no effort whatsoever. And... zeldris is supposed to do something here? The way I see it there's very few possible scenarios here.
1.- Zeldris gets one shot.
2.- Zeldris reveals an assault mode or a godly form and gets one shot.
The only way what follows is in any way anything other than a wasted of ink is that something other than lancelot easily winning happens. And I mean just in general, not something like mael appearing, holding the fort a little longer but still loosing.