Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Select 1 Normal Monster you control. When the selected monster inflicts Battle Damage to your opponent this turn, your opponent discards 2 random cards.
--義賊の極意書
--Secrets of the Gallant
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.filter(c)
	return c:IsFaceup() and c:IsType(TYPE_NORMAL)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and s.filter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE,0,1,1,nil)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and tc:IsFaceup() and not tc:IsImmuneToEffect(e) then
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetDescription(aux.Stringid(id,0))
		e1:SetCategory(CATEGORY_HANDES)
		e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
		e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
		e1:SetCode(EVENT_BATTLE_DAMAGE)
		e1:SetLabel(tc:GetFieldID())
		e1:SetCondition(s.hdcon)
		e1:SetTarget(s.hdtg)
		e1:SetOperation(s.hdop)
		e1:SetReset(RESET_PHASE|PHASE_END)
		Duel.RegisterEffect(e1,tp)
	end
end
function s.hdcon(e,tp,eg,ep,ev,re,r,rp)
	return ep~=tp and eg:GetFirst():GetFieldID()==e:GetLabel()
end
function s.hdtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetTargetPlayer(tp)
	Duel.SetOperationInfo(0,CATEGORY_HANDES,nil,0,1-tp,2)
end
function s.hdop(e,tp,eg,ep,ev,re,r,rp)
	local p=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER)
	local g=Duel.GetFieldGroup(p,0,LOCATION_HAND)
	local dg=g:RandomSelect(tp,2)
	Duel.SendtoGrave(dg,REASON_EFFECT|REASON_DISCARD)
end