I would just go for the nair, unless you screw up the timing it will at least clash. Glide attack is longer, but I'm pretty sure nair is faster. Rising fair can work if he's not gliding downward same with uair. But if you're on the ground and for whatever reason can't/don't want to jump. You can vanish... but personally I would run away and b-reverse ground needles, since most MKs arent gonna chase you across the stage with glide. You could also walk away and space a dacus... But thats mad risky, you could also try to grab armor it like a pro but I wouldn't do that more than once and likely not even that many times. Vanishing is only gonna work against unaware people unless you do it in the air at them. And unless you can do the low auto cancel version of the ground vanish, you'll probably get hard punished, knocked off the stage, then gimped at 72%