[Cassandra watches Elsa lash out, a quick strike and follow-through, a bit off - naturally for a beginner, but it's good! Quite good, in fact. It sends a flutter into Cass's chest.]

Hm! Not bad! Now, what you want to do is keep your wrist straight a you're swinging it. Like this-

[Cass moves without thinking. Shifting behind Elsa, she reaches around the queen's shoulders. Her hands come to rest atop Elsa's as Cass guides them.]

That way the blade will... shake less when it comes into contact.

[Oh, they are very close.]