Board Thread:Manga/@comment-31094679-20170119221314/@comment-29945764-20170202125414

Crack theory: Eren will be able to harden his fists in human form and shatter Annie's crystal by punching it. Shifters have been able to use titan powers in and out of titan form, such as regeneration and being able to transfer their consciousness to their whole nervous system and we still don't know the capabilities of a shifter's power so it might be possible for Eren to harden his fists outside his titan form.