How do I add knockback to this enemy NPCs damage script? [SOLVED]

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--By Zgoly --
--Variables--
local Npc = script.Parent.Torso

--Code--
local function PlayerTouched(Part)
    local Player = Part.Parent
        if game.Players:GetPlayerFromCharacter(Player) then
            Player.Humanoid.Health = Player.Humanoid.Health -5
            local bv = Instance.new("BodyVelocity")
            bv.Parent = Player.HumanoidRootPart
            bv.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
            bv.Velocity = Player.HumanoidRootPart.CFrame.lookVector *-100
            wait(0.1)
        bv:remove()
    end
end

Npc.Touched:connect(PlayerTouched)

I suppose by adding knockback you mean pushing the target. To push a part, use the Velocity property:

local hum = script.Parent.Parent.Humanoid
local banditpunch1 = hum:LoadAnimation(script.BPunch1)
local human
local debounce = false
part = script.Parent

script.Parent.Touched:connect(function(hit)
    if debounce == false then
        debounce = true
        human = hit.Parent:FindFirstChild("Humanoid")
        if (human ~= nil) then
            banditpunch1:Play()
            wait(.12)
            human.Health = human.Health - 5
         --Pushes the Hit part in the same direction as Part. "100" is the amount of force
         local direction = part.CFrame.lookVector * 100
            hit.Velocity = direction
        end
        wait(1)
        debounce = false
        banditpunch1:Stop()
    end
end)