User blog comment:Sagee Prime/Champions bugs!!! What are they? I must know!!!/@comment-3059224-20110408125408/@comment-3323227-20110408130652

Also there were other changes so Yi wouldn't travel too far when using Alpha strike and this may be why he is bugging out. RIOT didn't want him to travel too far when using the skill because he teleports to the target most of the time. With that in mind a common strategy before they changed this was to get i to Alpha strike you and then quickly move to the turret to try and kill Yi when he reappeared.