Sultan
Kitana, Scorpion
Recreating your situation, black adam constantly back dashing on record, and then trying to time the reset worked a few times.Here is a video of the of the command grab vs backdashing in the corner. As you can see, it's not catching the backdash, it's just before the invulnerable frames ( same timing as ducking and jumping).
Try my method though, try recording Frost performing the mb freeze - mb freeze link. Then try backdashing out with black adam. I have yet to make this work. Like, as I type I have cpu frost perfectly timed to perform the mb freeze - mb freeze (it eats jumps, ducking) but I can still backdash out.