Stronghold 5-5, we've spotted a Fusilier hot on your trail. If you are directly hit by one of its grenades, waste no time throwing it back.

Fusilier spawned in and then started to run towards your team, Before shooting the grenades at them with his grenade launcher.

One got stuck on you and prepared to detonate it, But you took it and deactivated it, Seems like you can use this item to throw it back at fusilier..