[His entire body is tense, arms rigid at his sides, fingernails digging into his palms as he tries to hold himself together. He doesn't know how to explain his actions, because he doesn't understand it himself.]
...I have no other choice. [An evasive answer, but it reveals at least a fraction of the truth.]
no subject
...I have no other choice. [An evasive answer, but it reveals at least a fraction of the truth.]