How do i fix this glitch?

local A = Instance.new("Hint",game.Workspace)

while game.Workspace.Intermission.Value == true do
    wait(1)
    game.Workspace.Time.Value = game.Workspace.Time.Value - 1
    A.Text = "game will start in "..game.Workspace.Time.Value--Intermission



    if game.Workspace.Time.Value == 0 then
        A.Text = "Game Starting!!!"
        A.Parent = game.Lighting
        game.Workspace.Intermission.Value = false -- Start Game

        players = game.Players:GetChildren()
        for i = 1,#players do
        wait(0.5)
        a = game.Workspace:WaitForChild(players[i].Name)
        a.Torso.CFrame = game.Workspace:FindFirstChild("P"..i).CFrame
        end
    for b = 0,500 do
    wait(0.1)
    game.Workspace.Wall.CFrame = game.Workspace.Wall.CFrame * CFrame.new(0,0,0.5) * CFrame.fromEulerAnglesXYZ(0,0,0)
end
        wait(5)
        A.Text = "Game Ended!"
        A.Parent = game.Workspace
        game.Workspace.Time.Value = 20
        game.Workspace.Intermission.Value = true
    D = a:FindFirstChild("Humanoid")
    D.Health = 0

        game.Workspace.Wall.CFrame = game.Workspace.WallBase.CFrame

    end

    end


game.Players.PlayerAdded:connect(OnPlayerEntered)

The player doesent die after the game is over and sometimes only one player dies