Ultima vox eius haec inter homines audita est, cum maiorem sonitum emisisset illa parte qua facilius loquebatur: "Vae me, puto, concacavi." Quod an fecerit, nescio - omnia certe concacavit!
I understand what it means but I am unsure about the qua. "He had sent out a sound from that part from which he easily spoke..."? Is that what it really means, that he spoke from his rear? Or perhaps it is qua (re) and so he spoke because of the noise to excuse himself?