Science fiction is a dialogue, a tennis match, in which the Idea is volleyed from one side of the net to the other. Ridiculous to say that someone 'stole' an idea: no, no, a thousand times no. The point is the volley, and how it's carried, and what statement is made by the answering 'statement.' In other words if Burroughs initiates a time-gate and says it works randomly, and then Norton has time gates confounded with the Perilous Seat, the Siege Perilous of the Round Table, and locates it in a bar on a rainy night do you see both the humor and the volley in the tennis match?
C. J. CherryhHonor to the earth," the abbot said, "honor to the dead in the passing of the year; honor to the living, in the coming of the new. A Great Year passes tonight. A new one begins. Let the good that is old continue and let the rest perish.
C. J. Cherryh