Two minutes after that, the controller said, "Seminole 4PA, descend and maintain 5,200." N304PA responded, "Down to 5,200 for 304PA." The controller, whose intent had been that 434PA continue its descent past 6,000 feet, did not notice that the response came from a different callsign. The crew of 434PA was aware of the ambiguity, however, and requested a clarification, but the first part of their transmission was blocked by the controller's instruction to another aircraft. The controller heard only " … for 434PA?" and, possibly thinking the question referred to the transmission he had just made, replied, "No."