Scene 12 is a placeholder.
What we need to happen is to create a situation where Azaghal King of Belegost is visiting Laurin King of Nogrod to feel out the possibility of alliance (not just trading agreement, but military alliance) with the Noldor. And Eöl, the guest of the dwarves of Nogrod, is not invited to be part of those discussions (his enmity with the Noldor is well-known, and his friendship was with the former king, who has since died).
The goal for the scene is to create a situation where Eöl is ignorant of this snub (and thus unaware that a private political negotiation is happening), while Maeglin figures out what is going on (at least enough to know that there is important business discussing the Noldor, and that Eöl is being deliberately excluded). So, the question is...how to accomplish that? Assume for a moment that both Eöl and Maeglin speak and understand Khuzdul. Also assume that we don't want this scene to consist of Maeglin snooping/eavesdropping behind a door while an important conversation happens. Separating the two characters is fine.
Any suggestions?