Multiple NPC debounce not working?

I'm trying to make it so that when I swing a sword, I would like to hit everyone touched by the blade only once. When it was hitting only one person, it works fine, but if I hit multiple people, it instantly kills them, somehow passing the debounce. My guess is that it isn't checking for the target fast enough until Touched fires again. How do I fix this?

Slash function:

local function IsAlreadyAffected(affected, target)
    for _,v in pairs(affected) do
        if target == v then
            return true
        end
    end
    return false
end

function EvasionSlash()
    if inAction.Value == true then return end

    if cooldown == false then
        --This is the multiple player debounce.
        local affected = {}

        cooldown = true
        inAction.Value = true

        Humanoid.WalkSpeed = 0
        Humanoid.JumpPower = 0

        Evasion:Play()

        local MoveBack = RunService.RenderStepped:Connect(function()
            RootPart.CFrame = RootPart.CFrame - RootPart.CFrame.lookVector*0.2  
        end)

        local Attack

        local SlashBegin = Evasion.KeyframeReached:Connect(function(Keyframe)
            if Keyframe == "SlashBegin" then
                Trail.Enabled = true
                MoveBack:Disconnect()
                Attack = Character.Blade.Touched:Connect(function(hit)
                    if not IsAlreadyAffected(affected, hit.Parent) then
                        table.insert(affected, hit.Parent)
                        game.ReplicatedStorage.Damage.Damage:FireServer(100, hit)
                    else
                        print(hit.Parent.Name, "already affected.")
                    end
                end)
            end
        end)

        local SlashEnded = Evasion.KeyframeReached:Connect(function(Keyframe)
            if Keyframe == "SlashEnd" then
                Attack:Disconnect()
                Trail.Enabled = false
                inAction.Value = false
                Humanoid.WalkSpeed = 16
                Humanoid.JumpPower = 50
            end
        end)

        wait(COOLDOWN_TIME)
        cooldown = false

    end
end

This is the server side of the remote event:

DamageEvent.OnServerEvent:Connect(function(player, damage, enemy, class)
    local target = enemy.Parent:FindFirstChild("Humanoid") 
        if target then
            damage = damage * enemy.Parent.NormalResist.Value
            target:TakeDamage(damage)
            local p = math.random(1,2)
            if p == 1 then
                p = false
            else
                p = true
            end
            visuals.OverheadVisual(enemy, damage, "Physical", p)
        end
end)