function isSpawned(player)
    if workspace:FindFirstChild(player.Name) and player.Character:FindFirstChild("HumanoidRootPart") then
        return true
    else
        return false
    end
end

while wait() do
    for i, v in pairs(game.Players:GetPlayers()) do
        if isSpawned(v) and v ~= game.Players.LocalPlayer and not v.Character.Head:FindFirstChild("UnoReverseCard") then
            if (v.Character.HumanoidRootPart.Position - game.Players.LocalPlayer.Character.HumanoidRootPart.Position).Magnitude <= 50 then
                game:GetService("ReplicatedStorage").g:FireServer(v.Character["Right Arm"])
                wait(0.1)
            end
        end
    end
end