Since McCoy was still hauling Spock's marbles at the time, Spock didn't have any of the mental discipline or the telepathic link to trigger pon farr, it's debatable whether or not he actually was undering pon farr, or just another growing pain from his rapid aging, and Saavik misinterpreted his distress.
In other words, "Amok Time" is the most misinterpreted episode in all of Trek lore, bringing us the slight mishmash of ST III and the utter bilge of Voyager's "Blood Fever".
Why must we assume Spock needed mental discipline (a feature that is entirely lost during the "blood fever"or telepathic links to trigger the pon farr? Those things are unquestionably part of the Vulcan ceremonies of Spock's time. They appear to serve as an attempt to regulate the outcome, to some degree, of what what would otherwise be chaos. But couldn't pon farr be a far older element of Vulcan physiology than the logic of Surak?
We might be talking about the wrong marbles here when it comes to what triggers pon farr.![]()
Like McCoy said, this is the price they pay for having no emotions the rest of the time. In other words, pre-Surak, they didn't need a pon farr cycle to regulate the release of intense emotions, they just did whatever they wanted....and nearly killed themselves off in the process.
Spock, in the state he was on Genesis, lacked any of the mental training, plus he had no telepathic link with a prospective mate to trigger a response. Therefore, it's doubtful that he was actually undergoing pon farr, at least not in the modern sense.