I keep infinitely going up slowly, why is my fly script not working?

I have a fly script here in a Module script. I'm using Cmdr. Everything about the Cmdr and the module works, it's just the fly script that doesn't work. Here is my script:

return function (_, players)
    for _, player in pairs(players) do
        local char = player.Character
        local hum = char:WaitForChild("Humanoid")
        local Torso = char:WaitForChild("Torso")
        local Mouse = player:GetMouse()
        local debounce = false
        local BV = Instance.new("BodyVelocity",Torso)
        BV.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
        while debounce == true do
            BV.Velocity = Mouse.Hit.lookVector*100
            wait()
        end
    end

    return ( "%d players have been given the ability to fly."):format(#players)
end

Whenever I run the fly command I just start infinitely going up pretty slowly.