Why wont this gun kill people entirely?

I made a gun, and it shoots, but when i shoot someone dead, they are still alive on thier screen, but on my screen, they are dead, but dont respawn, please help me, ive been trying for hours to find a good way to script my gun without having any reloading or GUI stuff, so heres the script:

Player = game.Players.LocalPlayer
mouse = Player:GetMouse()
maxAmmo = 50
ammo = maxAmmo
rate = 0.1
firing = false
Canfire = true
reload = 5
damage = 20
script.Parent.Activated:Connect(function()
    if ammo >= 1 and Canfire == true then
        firing = true
        repeat local bullet = Instance.new("Part", workspace)
            bullet.CanCollide = true
            bullet.Shape = "Ball"
            bullet.Size = Vector3.new(0.4, 0.4, 0.4)
            bullet.Material = "Neon"
            bullet.BrickColor = BrickColor.new("Bright yellow")
            bullet.CFrame = CFrame.new(script.Parent.Handle.Position, mouse.Hit.p)
            local v = Instance.new("BodyVelocity", bullet)
            v.Velocity = bullet.CFrame.LookVector*520
            game.Debris:AddItem(bullet,5)
            bullet.Touched:connect(function(hit)
                if hit.Parent ~= Player.Character and hit.Parent:FindFirstChild("Humanoid") then
                    hit.Parent.Humanoid.Health = hit.Parent.Humanoid.Health - damage
                    bullet:Destroy()
                end
            end)
                wait(rate)
        until ammo < 1 or firing == false
    end
end)
script.Parent.Deactivated:Connect(function()
    if firing == true
    then
        firing = false
    end
end)
mouse.KeyDown:connect(function(key)
    if string.lower(key) == "r" and ammo < maxAmmo and firing == false then
        Canfire = false
        wait(reload)
        ammo = maxAmmo
        Canfire = true
    end
end)