Annie bug (gameplay)

while playing against an annie earlier today i was zed and my friend was master yi well multiple times annie who was on the opposing team would have stun use a move ie tibber or q and we would either ult as zed or alpha strike as yi which would allow us to dodge the attack and stun however it would abosrb the attack but the stun would remain and she could immediatly stun after dont know what is going on but would appreciate any feedback also any inquire into this.