this script that displays the damage is not functioning as i'd like it to. what's wrong?

Pretty much, I am trying to make a damage script. Say I have a sword, and it deals a different amount of damage each time, like (5, 8, 9). But instead of it displaying the individual amount of damage, it displays the total amount of damage done.

How can I fix, and or what should I add to this script to make it work?

I want this script to display the damage differently each time, but it is just showing the total amount of damage being done.

Info: This script is the parent of a BillboardGui inside an NPC's humanoid.

local humanoid = script.Parent
local cHealth = humanoid.Health

humanoid.HealthChanged:Connect(function(health)
    local Gui = script.DamageCounter:Clone()
    local change = math.floor(cHealth - health)
    if change == 0 then return end
    Gui.TextLabel.Visible = true
    Gui.Parent = humanoid.Parent.Head
    Gui.TextLabel.Text = change
    wait(1)
    for i = 0, 1, .1 do
        Gui.TextLabel.TextTransparency = 1
        Gui.TextLabel.TextStrokeTransparency = 1
        wait()
    end
end)