I dont quite understand his challenge 27. I have to admit Jins combos must be timed quite strict(imo). Anyway the combos is follows:
5C, 5D, 214D ~ C (wall stuck), 66 longDash, 6C, 214B, 5c, 22C, 5B, 5C, 2C, j.C, j.2C, JC, j.C, j.2C, j.214D, fall down OD j.214C, 3C, 623B, Ice supermove.
I screw up after OD, j.214C because I'm too far away for the 3C, 623B. I tried to dash 3C, 623B but then the 623B whiffs as Azreal recovers.
Edit: I got it. always jump forward and do the j.214C little bit higher. Anyway I cant perform the combo with a dash into 3c 623B. Someone said I'd do the 623B to slow.