Do Prophets and SEs really want a skill that seldom lands, never lethal strikes, and costs 2500a (or more) each time you cast it? Not to mention, unlike Undead (about 8-10% of mobs), Holy mobs are far less than 1% of the population, so why would you want Turn Seraph instead of Turn Undead? For that matter...why would anyone want Turn Undead?
I had Kat the Cat paralysed once so that it looked like he was giving me a backrub while i was sitting down in front of him... lost the screenshot though. :P
How about something more active like pdef reduction on seraphs?