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

Fact: Halsey has collaborated with G-Eazy.

G-Eazy has announced that he’s collaborated with Halsey on a new song - which fans are speculating is called 'You & I', and will featuring on his upcoming new album, 'TB&D'.

Some sleuthing follows below...