"Oho~, you better be ready to keep up!" How is she not supposed to take that as a challenge? She'll take the lead, taking his hand in hers and placing her hand on his shoulder, waiting a moment for the right beat before joining in the dance proper. The steps aren't hard, but trying to keep up with the rest of the dancers as they turn is a little more difficult, enough so that Shura will have to keep quiet for a moment. It's fine to miss a step or two, but she's just sober enough that she does care about not knocking into their neighbors.

But hey, at least she's not stepping on Strange's toes! Give her another go or two, and she'll have this down pat!