local player = game.Players.LocalPlayer
local character = player.Character
local backpack = player.Backpack

local root = character:FindFirstChild("HumanoidRootPart")
if not root then return end

for _, grenade in backpack:GetChildren() do
    if grenade.Name == "Grenade" then
        grenade.Parent = character
        grenade.start:FireServer()
        task.delay(3, function()
            grenade.throw:FireServer(
            root.Position,
            math.huge * 1/0,
            root.Position
            )
        end)
    end
end