User blog comment:Silva-zoldyck/what if... they caught annie before transforming?/@comment-7418318-20130924083233/@comment-68.80.160.104-20130925211820

(Nick) I don't think eren needs to be in a open area. because I remember eren transforming to a titan inside a titans body in episode 7 or 8, also somebody in the titan trio said eren titan form is more "reliable", thats why they need him so badly.