Being quiet

This morning. Jane and Alice are in the next room.

Alice: Be quiet!

Ooooh, I think. Jane's not going to take that. There's going to be a fight. 

Alice: Be QUIET!

Do I intervene now, or wait to see how Jane handles this?

Alice: BE! QUIET!

I can't believe Jane is taking this. Alice must have bound and gagged her.

Alice: BeeeEEEE... KWAI-ET!!! QUIET! QUIET! QUIET!

Me: Ok, that's enough. What's going on in there?

Jane: (emerges holding her favourite doll, Cugga) We're just putting our babies to sleep.