It’s really easy for an odd hitbox interaction to slip past a developer. When you consider the “Number of Characters” multiplied by “the Number of Unique Moves” each character has, it becomes a complicated web to hitboxs and hurtboxs to keep track of.
So it’s likely not intentional that 8 characters (Sub-Zero, Catwoman, Cheetah, Batman, Flash, Scarecrow, Starfire, and Black Canary) in Injustice 2 can duck under the mid-hitting flip in Green Arrow’s meter-burned special move, “Hurricane Bow.” As MK_REO demonstrates, if you’re ready for this interaction you can get a full juggle against the crime-fighting archer, regardless of whether he spends meter or not. One wonders what else the lower crouching hurtboxs of these 8 characters can go under.
[Note: This interaction may not have survived the version 1.08 patch.]