How does the downgrade Shadowed work?

By irchris5000, in Star Wars: Destiny

If I play shadowed on a character, when does the controlling player take indirect damage? when he/she activates the character? resolves those character's dice? Sorry if I missed a clarification somewhere, but its a little confusing.

It triggers when the attached character uses one of its actions printed on the card. Examples include: phasma3 bringing in her 2 stormtroopers, wat tambor playing a red support and immediately rolling its die in, Palpatine rolling a die on one of his equipped abilities in. If the character has no actions printed on their card, then unless you're worried about spotting a downgrade (trandoshans), attaching it to the character is useless.