We've only got a few hours before the island sinks, yeah? So in order to keep our timeline smooth, we need to send back a horse now, right? Before we reach Romenna, as the trip, even on the Energizer Kariborimbunnies, takes at least a few hours. Also, whoever writes that in should account for what this horse has been doing while riderless. Surely the Faithful would notice a passengerless horse cantering along-side them?
On the plus side, my characters currently don't have the mindset to notice Abarzadan gone. Kath's dying (maybe? haven't decided yet.) and Inzi's blaming herself for it. I feel that I really must foist this twist off on someone else, as they just can't deal with it.