Fizz's E

Not sure if this is a bug or not, but someone suggested to me that it has to be. Basically, I was playing Lissandra and went top to go help fight against Fizz and as I went to ult him he was able to E out of it and my ult didn't go on cooldown. What was strange was the circle and some of the ice had started to form around him before he used his E, but it just cancelled my ult and it was as if I hadn't even used it. I then tried to use it for the second time in the same fight and again the exact same thing happened. Can anyone explain if this is supposed to happen or if this is a bug?
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