Chapter 34:
To be honest, Orochimaru wasn't particularly impressed by the Second Hokage, Senju Tobirama.
During his time in Konoha, Orochimaru had rarely seen the Second Hokage in person. The only time was when he accompanied Sarutobi to the front lines. The day-to-day tasks of their squad were mostly delegated to Hiruzen, their direct instructor.
As for Orochimaru, other than seeing the Second Hokage give the occasional large lecture from a distance, he had no direct interactions with him. The demands of the war kept the Second Hokage busy, and it was rare for Genin like Orochimaru, Jiraiya, and Tsunade to even get close to the Hokage, unless it was a matter of utmost importance.
Because of this, Orochimaru didn't feel particularly connected to the Second Hokage. So, when he pieced together that Tobirama was about to meet his tragic end at the hands of the Gold and Silver Brothers, he could only offer a silent apology in his heart.
Would Orochimaru try to prevent the Second Hokage's death? Not likely. He would have liked to alter the course of history, sure, but certain things were beyond his control. Some events were meant to happen, and others weren't worth the risk of changing.
Even though Orochimaru had grown stronger far beyond the average Genin he was still only nine years old. No one would take a child seriously if he suddenly ran up to them, declaring that the Second Hokage would be killed in a coup orchestrated by the Gold and Silver Brothers.
They'd look at him like he was crazy, and he might even end up locked away in a cell or worse, subjected to interrogation and experimentation for how he possessed such knowledge. Even if Hiruzen backed him up, the higher-ups might still view him with suspicion. After all, how would a boy know something like that?
Besides, if he were completely honest with himself, what did Senju Tobirama's life or death have to do with him? Orochimaru wasn't the person he used to be not after everything he'd gone through.
The hard lessons from his previous life had taught him that good people often meet unfortunate ends, while those who are ruthless survive. Orochimaru had no interest in playing the hero or meddling with fate. He had no personal attachment to the Second Hokage, and getting involved would only endanger his own future.