Try watching again ep.9
Skiing and a Vampire
It's the time where they go to the human world where Mizore's mom has a ski resort, Mizore then kidnaps Tsukune by orders from her mother to make a baby, but Mizore made an ice replica of Tsukune which was just ice.
For Mizore sulking on the stairs it's on the first season on Mizore's first appearance episode 7 Snow Girl and Vampire
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Vampire+Sisters
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