QuoteAttachments on a card that changes control do not themselves change control.
Grasp of Earth
Guidance of the Ancestors
Honored Blade
Watch Commander
Togashi Kazue
All of these have actions of their own. Other attachments give the attached card actions, but those would still be attributed to the character.
So does this rule mean that, if some sneaky Scorpion takes control of my Shugenja with Grasp of the Earth attached, they can't take its action, but I still can? Even though I don't control the Shugenja any more? If so, this is a weird rule. An interesting one, but still. Strange.