Now the reaction of the human body, while remarkably fast, need certain finite measures of time and have been measured over and over again with a great deal of accuracy. The commands of the brain, speedy as they may be, must be carried by sluggish nerves and put into operation by inert lumps of muscle. Therefore to say that Jason's reactions were instantaneous is to tell a lie, or at least exaggerate. Only to his watchers did his actions appear to take place that fast; they were older, and less alert, and had not had the advantage of Pyrran survival training. So to their point of view the sacred portal was opened and Jason vanished in a flurry of activity. Two lightning blows sent his guardians spinning, and before they had fallen to the floor their supposed captive was through the door and it was slammed in their faces. Before the first dumfounded Persson could jump forward the bolt grated home inside and the door was sealed. Things were a little more complex than that to Jason. When the door opened he had had a good view of the inside of the room, of a slave cranking the handle on a crude collection of junk that could only have been a generator. Thick wires looped across the room from the thing to a man who stood before some blades of copper pushing at them with a wooden stick, while above his head fat sparks leaped the gap between two brassy spheres. As if to complete this illustration for a bronze-age edition of "First Steps in Electricity" another cable twisted up from the spark gap and vanished out a small window. The entire thing might have been labeled "How to Generate A Radio Signal in the Crudest Manner." As Jason reached this conclusion in the smallest fraction of a second, and at almost the very same instant, he heard the sound. What he heard could have been distant thunder, an earthquake, a volcano or some giant explosion. It rumbled and rolled, muffled by distance, yet still clear. It resembled none of these things to Jason, but made him think only of a high altitude rocket or jet, cleaving through the atmosphere. It must have been the juxtaposition of these two things, occurring as they did at the same time, the view of a radio transmitter, no matter how crude, and the thought that there might be a civilized craft or some kind up there containing men who would come to his aid if he could only contact them. The idea was an insane one, but even as he realized that fact he was through the door and bolting it behind him. Perhaps he did it because he had been pushed around entirely too much and felt like pushing someone else for a change. In any case it was done, insane or not, and he might as well carry through.