Sivir Spellshield and Amumu

Playing around in a normal today when amumu threw his Q at me while undertower, which i easily hit E to spellshield. The funny thing is, I still got rooted, he still lunged on me even though The E returned mana and the animation went off. Luckily I had an on the ball Soraka that saved my life. I see that there are already a lot of Spellshield bugs so heres to adding another.