Board Thread:Manga/@comment-5774380-20151009004044/@comment-24407809-20151009032346

Annettelovesanime wrote: What happened to Ymir?!?! In the chapter, Armin noted that he found three cups at the abandoned camp. Now, the first assumption would be that these cups belonged to Reiner, Bertolt, and Beast (wish we'd learn his name already!), but Erwin pointed out that the fact that the pot at the camp was cold means that the group must have had a lookout to warn them when the Corps was approaching, which would give them enough time to hide, and give the pot enough time to cool before the Corps got there. At the end of the chapter we the Beast Titan transform from a position far away from where Reiner was discovered. I think the Beast Titan was the lookout for the group, and the three people at the camp were Ymir, Reiner, and Bertolt. I assume that the group (especially not the Beast Titan) trusts Ymir enough to leave her alone, so the fact that Reiner was alone when he appeared means that Ymir is likely hiding with Bertolt and will make her move when he does.

EDIT: It's also possible that Ymir is one of the Titans that the Beast Titan is leading into battle.