poor gameplay features

Just played a game as Syndra against a Yasuo. A few minor issues on the gameplay side. For one, when Yasuo has his flow shield up I understand damage will not cause a tower to award the kill if the damage is not dealt to the health bar however, CC effects should still award it to you correct? I pushed Yasuo back under my tower using Syndra's third ability and was not awarded the kill upon his "execution". Please inform me as to whether the kill should be awarded in this situation or if it is designed to be this way for a reason. Unrelated to champions, I also noticed that if you begin a backing animation prior to completion of Baron your back will still take the full time. Not a major issue on that one just something that didn't feel appropriate to me.