Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
2 Level 2 monsters Cannot be destroyed by battle while it has material. At the end of the Damage Step, if this card battled an opponent's monster: You can detach 1 material from this card; return that opponent's monster to the hand.
--神騎セイントレア
--Sky Cavalry Centaurea
local s,id=GetID()
function s.initial_effect(c)
	--xyz summon
	Xyz.AddProcedure(c,nil,2,2)
	c:EnableReviveLimit()
	--indestructable
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
	e1:SetCondition(s.incon)
	e1:SetValue(1)
	c:RegisterEffect(e1)
	--return
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_TOHAND)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_DAMAGE_STEP_END)
	e2:SetCondition(s.retcon)
	e2:SetCost(Cost.DetachFromSelf(1))
	e2:SetTarget(s.rettg)
	e2:SetOperation(s.retop)
	c:RegisterEffect(e2)
end
function s.incon(e)
	return e:GetHandler():GetOverlayCount()>0
end
function s.retcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local bc=c:GetBattleTarget()
	return bc and c:IsRelateToBattle() and bc:IsRelateToBattle()
end
function s.rettg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,e:GetHandler():GetBattleTarget(),1,0,0)
end
function s.retop(e,tp,eg,ep,ev,re,r,rp)
	local bc=e:GetHandler():GetBattleTarget()
	if bc:IsRelateToBattle() then
		Duel.SendtoHand(bc,nil,REASON_EFFECT)
	end
end