I had accepted the possibility when he'd taken the mission. A small mercenary group had begun making its presence known in Fire Country, and while that wasn't unheard of, and didn't usually require a Konoha to take them in case of competition, there was suspicion there was suspicion that one of our missing nin was leading them. I'd been sent in undercover, pretending to be a missing nin myself, to determine whether or not that was true, and to report back to the Hokage in 6 months on my findings. I was a an exceptional actor, even among ninja, and so I had easily made it into the group. Many of them liked me, though there were a few didn't like the fact that I'd shown them up on some of the missions. I'd worried for a moment that I should play my abilities down and allow their egos to heal, but this was a mercenary group, and we were expected to want to one-up the others.
Three months in however, I slipped. My cover was blown, and I found myself restrained tightly in one of their bases. During the training ninja underwent before undercover missions, I'd received pain tolerance training and been drilled on proper protocol when undergoing interrogation in enemy territory. I knew what I was to to in this situation. Wait it out and escape if and when possible. I didn't possess any information vital to the security of my village so suicide wasn't necessary, and my mission hadn't included planting false information so I had no need to focus on anything but escaping my imprisonment.
But I was in so much pain. and I was scared. These people were good at what they did, and I spend most of the time I wasn't being tortured sleeping so there was very little opportunity to plot my escape. I couldn't handle it anymore. I hated myself for it, but I couldn't.
My last conscious before I sent what little fire chakra I could in my weakened state into my heart was that I was glad that my family would only receive my name on the Stone as closure. I was a failure and they didn't need to know that.