Oi! Athwen won't be captured for long, no siree! Dorran will soon be coming to rescue, I've little doubt.
And, yes, the slavers that jumped over the trench are going to be falling into the tunnel without the slightest bit of doubt (at least in my mind). The horses will need a couple strides before they can stop or turn to recover from the jump, and those few strides will take them several yards (consider, each stride is more than six feet, surely!) and the tunnel is not that far from the trench. So....those nine, unfortunate riders are going to go down and probably are going to be thrown in the process.
What about Vror? I am concerned about him. Where, precisely, is he? And does anyone know he's there?
-- Folwren