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Collision Box Sizes
Air SB Interactions
Normally slashbacking On will still lock character in inescapable animation, but without scaling applied by the first hit. However using burst within 2 frames after slashback will result in character escaping, while still keeping Anji in animation. The animation is long enough for some characters to punish with Instant Kill.
FB On however recovers mid air leaving Anji with only 2 vulnerable frames and a big hitbox which can easily catch extended hurtboxes to force a favorable trade. Those factors make airthrow a preferable punish.