coup de main - noun
kü-də-ˈmaⁿ
Definition of coup de main : an attack that achieves complete surprise.

Watch Florence + The Machine cover 'Shallow'.

While in New Zealand recently, Florence + The Machine were caught rehearsing a cover of Lady Gaga and Bradley Cooper's 'A Star Is Born' duet, 'Shallow', backstage at Spark Arena.

Will we get a full/public performance of this sometime?