https://www.pcgamer.com/fortnites-shockwave-grenades-let-you-launch-players-through-structures/

Everything we know about Fortnite Season 6 suggests we're just weeks away from yet more big map changes, a new battle pass, a new theme, and plenty of new skins. Till then, Fortnite's Season 5 still has plenty to offer—such as its v5.30 content update, which is live now. 

Following last week's full v5.30 update, this content offering brings Shockwave Grenades, gold-plated weapons and a new limited-time mode. Built to "knock players back and destroy objects in their path after being knocked back", Shockwave Grenades prevent allies, enemies and vehicles impacted by the projectile from taking fall damage.