Disclaimer: TinySprite owns nothing of Sigma 6, which is owned by Hasbro. Only the plot is hers.
Prompt: Secret
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One of the fundamentals of being a ninja was being curious. Combine that with the other fundamental of being sneaky and by default ninja tended to learn a lot. Especially in a base where people would easily talk about nearly anything.
Though Snake Eyes did warn them to about applying caution and not eavesdropping on sensitive mission information, the three Joe ninja did tend to learn about things before the rest of the team. Sometimes they even found out things without meaning too, like the time Jinx was honestly accidentally in the right vent at the right time to hear Tunnel Rat's break up before even Heavy Duty knew anything or the time Kamakura saw HOUND painting itself a new collage of colors, finally ending the mystery of how it was happening.
The apprentices sometimes wondered what their sensei heard and saw, but never thought to ask him. Both out of respect for him and also because they knew he likely wouldn't tell them anything they didn't need to know. Besides, between themselves, the apprentices were usually ahead of the base's rumor mill, with only the occasional surprise catching them unaware.
But Jinx and Kamakura kept out of rumors for the most part, unless it was part of their mission to spread them. Because, above many things, a fundamental for a ninja was to be able to keep a secret.