How i am going to make this thing work? i'm trying to make knockback thing when players get hit by the punch script.

local dmg = true
local ready = true
local animations = {2491474896,2491473624}
script.Parent.Touched:Connect(function(hit)
   if hit.Parent:FindFirstChildOfClass("Humanoid") and dmg == true and ready then
	hit.Parent.LowerTorso.Velocity=hit.Parent.CFrame.lookVector *100 --the problem?
    local hum = hit.Parent.Humanoid
	local animation = Instance.new("Animation") 
	local picked = math.random(1,#animations)  
	animation.AnimationId = "http://roblox.com/asset/?id="..animations[picked] 
    local animTrack = hum:LoadAnimation(animation)
	hum:TakeDamage(10)
	script.Punch:Play()
	animTrack:Play()
	hum.WalkSpeed = 0
	dmg = false
	ready = false
	wait(0.3)
    dmg = true
	hum.Walkspeed = 40
	wait(0.7)
	ready = true
      end
	
end)

Thank you in advance

Anonymous