As the ghouls thin out, Thorn grabs the opening and emerges from her hiding place, moving with virtually superhuman speed as she circles the pack of ghouls to home in on the priest. Her chains seem to writhe and strike as if they were independent things, vicious black snakes with fangs of cold iron. Once as she closes in, then again, and then she's streaking away again, giving only the slimmest of opportunities for counterattack!
(Fleet Charge, costing 1 mythic point, to move up to 30' as a swift action and make a single attack. Then make a single attack, not a full attack, and move away 30'. This incurs an attack of opportunity from the priest ghoul against which Thorn has +4 AC from mobility for a total AC of 26.)
[roll0] and [roll1] +5 for 14, due to this not being an iterative attack after all, for [roll2] and [roll3] damage.