What a clause can bind

Three forms follow on or after. The common one binds a verb to the owner: on opening it, where it means this entity for the rest of the clause. The verb is a single word in its -ing form, and it must be a verb the story's actions or the platform's standard actions understand.

The second form listens to a verb aimed at anything, and names the role the clause cares about. Roles belong to the action: taking has a taker and an item, so a scarecrow can watch every theft in the garden. The third form, every turn, ticks with the clock rather than reacting to an action; it is on only, since a turn is not something you react to after the fact.

create the scarecrow
  scenery
  in the Kitchen Garden

  A scarecrow in a donated raincoat.

  on taking anything as the taker
    phrase scarecrow-stare
  end on

  on every turn while dusk, once
    phrase scarecrow-shadow
  end on

An entity-owned every turn clause fires only while the player is present with its owner; the scarecrow performs to an audience or not at all. Note while dusk: a story-level state is referenced as a bare word in conditions.