The whole crack process is totally independent of items, because as you have wished the processing must continue. The process is controlled by messages. If you press reset on simulation run start, the OnReset trigger eventually fires and sends an initial message. The OnMessage trigger receives the delayed message later, calls the operator, changes the color of the processor and sends a delayed message to free the operator in the future. The operator is arriving, gets into utilization. The next message is going into the processor. The OnMessage trigger fires again and the source code to free the operator is executed.
If your question was answered, can you please be so kind to accept it and ask a NEW question, that involves the NOT mentioned conditions. Many thanks!