[gameplay] canceling an attack close to the attack frame, resests your attack speed without damaging

I was playing shen in this situation, and had my ki strike up. I went to attack a target, but then switch targets to attack the one right next to my first target.

Shen had started attacking the first target, but did not deal damage, and his ki strike remained up. He turned to the new target, yet did not attack right away, as though waiting for his attacks per second to come up again--though he never officially made an attack.