Maybe Augment blood can't stop Ceti eels? He does say in that same scene that they killed 20 of his people.
(I can't believe that, out of all of the potential objections, people are focusing on a continuity error between films separated by 30 years, rather than this being yet another
dumbass get-out-of-death-free reset button. For Pete's sake, can't anyone in Star Trek stay dead