 Why are the robots hunting Alan?
The robots were built to serve Man; to do his work, see to his comforts, make smooth his way. Without pausing to think, Alan leaped back, and fell sprawling over a bush just as one of the robots rolled silently up from the right, lowering its blaster barrel to aim directly at his head. The metal killers, tuned to blast any living flesh, would murder them the instant they stepped from the ship! The planet's double moon had risen and he could see a robot rolling slowly across the clearing in his general direction, blasting indiscriminately at whatever mind impulses came within its pickup range, birds, insects, anything. Apparently the robot hadn't sensed him yet, but Alan didn't know what the effective range of its pickup devices was.
 The robots aren't hunting Alan specifically. They are hunting all life forms.
 The robots aren't hunting Alan specifically. They are hunting all life forms.  The robots are hunting Alan because he invaded Waiamea.  The robots aren't hunting Alan. They're hunting pumas. Alan got in the way.  The robots are hunting Alan because he was illegally poaching pumas in the jungle.