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The first one I don't know if its a bug or if it was programmed this way, but Riposte doesn't stop Poppy's devastating blow. Which doesn't make sense since it stops siphon strike.
The second one is with her ult. If you are in a team fight against Master Yi, And he uses alpha strike during any part of Blade Waltz, it's stopped immediately and your put back in your starting position and deals no damage. I understand it working this way in a 1v1 confrontation, but against 2-3 its pretty bad never being able to ult in a game against a Yi