Fortnite season 4 week 9 challenge guide: Strike enemies with shockwave grenades Gozmoc October 22, 2020 A+ A- Print Email Season 4 week 9 of Fortnite is live now, and so are its new challenges. In this guide, we'll cover how to knock back three enemies with a shockwave grenade. via Mint VR Labels: Gaming | Digital Trends, Mint VR