lebanc passive vs malphite

was playing full ap maphite and i was against lebanc mid. I was really fed so i could blow up any squishies on the enemy team. But the problem was, don't know if its intentional or not (hope it is not cuz it seemed really unfair), when ever i ulted lebanc i dropped her below 40 % of her max healt so her passive would proc. so she went invisible the moment my ult hit her. she stayed in stealth during the duration of the knock up and became visiable after she jumped away. so i could never get my q of for the final blow. Don't know if it is intention. but i find i pretty ridiculous that she can get her stealth in while she is or should be knocked up. because you know a knock ip is unmitigable cc and stuffs :p. what do you guys think?
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