That hits a tender spot with Shura, who has often declared back in her world that her incommensurable strength should be used to protect the weak (as opposed to crushing them like so many in her world love to do).

"I have plenty of guts! I just... I feel what I was doing at home is more important? Here, there is an army! Over there... I'm alone." Not really alone, but without her, the Manikins would have no one to turn to.