(assistant ACT AGENT) means that AGENT is one of the agents assisting in the performance of ACT; AGENT itself may or may not also be performing ACT. AGENT is doing some tasks related to ACT but which are not directly subevent of performing the main or focus action. Thus, `assisting' here means doing such supporting activities as fetching supplies or tools needed in ACT; helping to manipulate objects involved in ACT; gathering an audience, or booking the performer, if ACT is a public performance, and so forth.