Rule 753.3
Restrictions and requirements applied to a chain item will also apply to new choices made for that chain item in this way. Example: If a card is played from facedown, it gains the restriction that it can only target game objects at the battlefield it was played from unless its targeting is restricted in such a way that choosing a unit at that battlefield is impossible. If a player makes new choices for such a card, they must still choose from among objects at that battlefield.