Why cant nocturne go "Unstoppable" when he dashes in ult?

oh ok thanks for clarifying that

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Nocturne's ult behaves the same way Malph's does. They're both unstoppable during the ult, they're not CC immune though, so can be CC'd and, if the duration's long enough, will still be CC'd after the ult ends. Ryze snare or Veigar stun for example won't stop them from completing their ults, but can limit them after they end if applied mid dash.

Can I Janna tornado them, because I'm pretty sure I can't unlike typical dashes.