Isnt it a rng that determines if you learned it after the mob is killed and not during the battle? Sorta like loot drops. Thats how I always assumed it worked.
Testing also showed that after a mob uses it once, forcing the mob to use it multiple times does no good to increase the chances of learning the spell since its only the first time the mob uses it that basically would put it in the 'loot list'. Therefore once a mob uses a move there is no need to let it live to use it again since your chances of learning said spell are gained by the mobs initial use only.
Going to see if I can dig up that test after I get home tomorrow

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