At least three different explanations are given in Trek novels--The Price of the Phoenix, Rihannsu#1: My Enemy, My Ally and Vulcan's Heart--(in the early days of Trek writing, many novels tended to contradict each other, and so the commander has had many different names and fates).
He determines to rescue both Kirk and James, and in this he has the assistance of the female Romulan Commander whom Spock and Kirk bested in the TV episode “The Enterprise Incident”.
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