@zero: I fgured hypersonic was pushing it so I contemplated supersonic. But I was sure even Akatsubaki could pull that off and be absolutely safe. Mach 3 or 4 just sounded bleh. Hypersonic just seemed to click with the requirements. Fast and suicidal. Rong should be dead, but the physical reinforcement system keeps him alive... though barely.
As for why I haven't posted it yet... should I?
