Hange fills you in on your way to the horses.

There was a bomb planted in Zackly's office that killed him and several other officers. People were rioting, demanding that Eren be released as he was the best choice for 'Eldia's salvation'- but then they discovered that Eren had escaped anyways and dozens of Survey Corps were missing. Hange rattled off names, but the only one you recognized was Floch, which just made you irrationally angry.

Hange told you that they call themselves the "Jaegerists". People who support Eren and whatever his plan may be without question.

Since when did Eren become so separated from everyone else? He was so normal, still friendly and loud, albeit a bit more reserved- and then he was gone to Marley, enacting his own plan with no guarantee that the Survey Corps would even follow it.

You should've noticed. You should've realized something.