He was trying to stop the derailed runaway train about to crash into the Queen's Palace in Peppa and the Unstoppable Train. He saw the brake lever was snapped so he jumped under the train, because there was a extra brake lever under there. After pulling it, the train swirled into a cliff and exploded. Peppa ran to Mac as he sat on the ground faking death. He said, "Goodbye Peppa." and faked death. Peppa then closed his eyes and she walked away and Mac got up later.