A visual discipline borrowed from classical kenjutsu and Filipino martial arts: the blade travels where the frame sends it, and the frame is always readable before the blade moves.
Identify the angle of a blade's committed line so you can leave it, not block it.
Set your gaze on the shoulder line, not the knife. The blade is fast and small; the shoulder is slow and large, and it tells you where the cut is going a half-beat before the hand does.
As the shoulder loads, step off the line at 45° away from the blade side. This puts you on the outside of the attacker's frame, where the blade cannot follow without a full reorganization.
From the outside line, your hands are free and the blade is on the wrong side of their body. Own the moment: create distance, control the weapon arm, or exit entirely.