How fast does a script run [Read Description]? Round Script PlayerAdded:Disconnect()

to be specific

I have a PlayerAdded Event that I constantly disconnect when my round script changes rounds

so basically the playeradded event switches on and off every time each having different things

The problem here was that

if there ever was a possibility of a player joining while the PlayerAdded disconnected and a new playeradded was made

then the game would break

the code runs like this basically

If Round.Value == 'Begin' then
    local NewEvent = game.Players.PlayerAdded:Connect()


    end)

    -- What if a player joins somewhere here
    -- And Is it possible?

    NewEvent:Disconnect()


end