[As Isaac prefers to keep to the action and seems to refuse to stay in one place properly in his recounts, we must turn to another source. Who better than his sister's recounting of events?

From 'The Biography of Rina Endyarr' Chapter Seventeen, Plainlander Town of Midnas:

We were back in that dreadful kitchen, I never could get the view of the owner's hanging corpse in the pantry out of my head. Isaac, Callum, Alexander and the girl Isaac saved were entering as I cleared the table, that girl had that poison in her. Like Callum and Alexander. She wouldn't last long, It's a miracle she still lives.

I spent two hours clearing her body of White Viper Venom and Death Caps, the paralysis and the killer. thankfully, I saved the girl's life. Though he tried to hide it, Isaac was beyond pleased. Anything to keep his mind clear and him happy. Alexander thought it a waste of effort and time, but Callum was indifferent. I wouldn't have cared much if she died, but I was happy that I saved another life that day, I already lost two from that poisonous concoction, and I wouldn't lose another. And lose her I did not. We learned her name, Laura Redfield, an orphan from The Capital of the Empire. So many were promised prosperity in this town so far from the Plains. She thanked us profusely and left, fate would allow us to see her again.

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Rina Endyarr's Biography by Rina Endyarr - Chapter Seventeen, Plainlander Town of Midnas

This is one of the rare times we see the kind side of Isaac, he seems to try to make himself seem unfeeling but deep down he cares for others. Even if some of his later actions suggest otherwise]