So there's a pretty serious bug right now where an enemy can not give kill credit if they die to a tower without taking damage through a shield, despite that shield being damaged. So far it's happened 3 times in a game where a Yasuo has dived and not taken damage through his shield.
this bug has existed since yasuo came out, its not just him its other champions with shields his is just tied to his passive, if you damage him before his shield activated IE you cause his shield to proc you will get credit because the turret will likely deplete his shield before he kills you allowing you to get one hit in and get credit for the kill
