All Quan's options off a vortex:
-B2
-B3
-12
-F4D4
-Charged B2 on it's own
-Charged B2 Hard-to-blockable with OH first
-Charged B2 Hard-to-blockable with Low first
-B2 hard-to-blockable with low bat first
-B2 hard-to-blockable with B2 first
-Low Bat into B3 to catch anyone trying to block the hard-to-blockable
-NJP Hard-to-blockable with OH first
-NJP Hard-to-blockable with Low first
-High chip damage blockstring
These are just his options off a vortex, and every one is safe(some with meter some meterless) and leads into big damage or vortex. He can choose to go for damage into oki instead which grants him even more options, including armor breaking.
If a video is really necessary then I'll do one later, but to get the B2 to hit first instead of the Low Bat you have to be at a certain distance away, about just outside of B1 range, and you have to B2 as SOON as you've sent the low bat. Because you're a bit further away, the B2 will hit while the low bat is still travelling whereas if you were closer the bat would have already hit before B2.