Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If a "Blackwing" monster you control battles an opponent's monster, and your opponent still controls that monster at the end of the Damage Step: You can send this card from your hand to the Graveyard; inflict 1000 damage to your opponent.
--BF－二の太刀のエテジア
--Blackwing - Etesian of Two Swords
local s,id=GetID()
function s.initial_effect(c)
	--atkup
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DAMAGE)
	e1:SetType(EFFECT_TYPE_TRIGGER_O+EFFECT_TYPE_FIELD)
	e1:SetCode(EVENT_DAMAGE_STEP_END)
	e1:SetRange(LOCATION_HAND)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e1:SetCondition(s.condition)
	e1:SetCost(Cost.SelfToGrave)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
s.listed_series={SET_BLACKWING}
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	local a=Duel.GetAttacker()
	local d=Duel.GetAttackTarget()
	return a:IsControler(tp) and a:IsSetCard(SET_BLACKWING) and a:IsRelateToBattle() and d and d:IsRelateToBattle()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetTargetPlayer(1-tp)
	Duel.SetTargetParam(1000)
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,1-tp,1000)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Damage(p,d,REASON_EFFECT)
end