Situational awareness probably works well 95-98% of the time.

But walking into a dark building from blinding sunlight, or into a mini-mart that has reflective film on the windows can still put you into a poor or bad situation.

Knowing some self-defense moves always seems better to me than not knowing ANY self-defense moves.

Your legs are longer and stronger than his knife arm. Fold his knee the wrong way and his focus will change dramatically.

Sue