Updated this scenario
(If your with Voltron and not the galra)
In this one this time you and the rest of Voltron were at the Blade of Mamora hide and you Keith and Shiro were inside to talk and on the way inside Keith was acting weird but you wanted to wait to ask until this talk with the Blade is over. Once there you saw one of the soldiers take Blade Keith had (you know how this episode goes.) you notice that one solider (my oc. Explain later) was watching Keith.
(Okay so in this the Blade found my oc and took her in to help her get away and learned she was galra and made her a member and she is watching what they are doing to Keith)
