Can Hidden Blade target a unit on another battlefield?

Ruling: Hidden Blade can target a unit on another battlefield if played from hand, but if played from hidden, it must target a unit on that battlefield.

Sequence:

• If played from hand: can target any battlefield
• If played from hidden: must target the battlefield it was hidden on

Nuances:

• The restriction to target the same battlefield only applies when playing from hidden, not when playing from hand