Great post Folwren!
But Sythric probably isn't lying down, half dead... He has been hit with a sword (from up to down) to the side - and he has a nasty slash-wound (and it hurts!). But as he discovers Raedwald dead, he will be infuriated, and will ride up to the ridge, seeking for revenge - and saving of the others - calling anyone able to come with him (he takes Raed's lance to pay back).
If you care to change your post with that in view? You could write anything about seeing Sythric running to see Raed., getting quite shocked for a moment, taking Raed's lance and calling Thydrė - asking all to come with him. You might also note, that he seems to be in great pains himself all the time, and bleeding from his side... Pick what you want from these - or don't use them. As you wish.
Could it overall be then, that:
By Dorran's cry, all the easterlings remaining should be riding towards the ridge - as their lord is doing - and they should follow him? It could be reasonable?
Then someone should remain with Brand (and Raed, already dead) - maybe Athwen? The others - those who dare (are online...
), should ride after the easterlings (we probably note Dorran and Athwen missing - and see the problem?)?
And a possible correction to Arry's tally: hasn't Meghan shot one easterling? So 1 added?