just an interesting observation about 4_5_6 B.
as people have noticed, the speed for these three moves are different (4B is slowest, 5B in the middle, 6B fastest).
if Yukiko uses 5B6B from full screen, the two fans hit almost at exactly the same time. this time difference make or break a combo.
eg, at long distances 4BB, 6D combos, but not 5_6BB, 6D. also, 1B, 6BB, 5C, 6BB combos, but not 1B, 5BB, 5C, 4_5BB