The druid and I took turns trying to solo. He got him to ~90% and I got him to ~95%. It'd probably be doable in high ICC gear or fire resist as long as you could pop off some FoLs as he's breathing or something. Getting overwhelmed by enraged adds made it hurt a bit, though. Plus, the enrage is fairly strict. You need to pull off ~2800 dps versus Sartharion while keeping yourself up.
I looked on Youtube and found a video of a DK and Holy Pally who did this the same night as us, but they were pushing the enrage timer towards the end.
Grats to them regardless, though. I'll post our video when we go back and I remember how to fraps properly next reset
EDIT: For what it's worth, we kind of did two-man a bit of trash when the druid sucked and got himself killed in the first 30 seconds on Shadron >.> That fight took about 15 minutes with prot pally dps, so yeah. Next week I'm going to con eight people into clearing the trash in 10 minutes before the two-man.