If you're one to not be prepared for a hitconfirm FC 5C into 6D, you can do the less spectacular corner 4 seal for less damage and a few nails. Much more reliable if you realise you got a fatal and already did 5D.
FC 5C>5D>623B>d.5B>5C>C-nail>jD>C-nail>d.6D>C-nail>5C>6D
4 Seals
2801damage
3 Nails
P.S.
Dont know if it was noted before, since I havent taken the time to read through the whole combo thread, but mid-screen 2D>jD>2B>5D>jB>j4C>j623B> 5D/6D works on everyone but Tager, Hakumen, Tsubaki, Hazama, Makoto, Valkenhayn, and I dont have Platinum so I dont know about her either.
*Special note* For Noel, and Ragna you need to time your jD differently.