I don't think it's necessarily a sad thing. It's of course a sad event for anyone to sustain a brain injury. But if he used his own techniques and they provably

I don't think it's necessarily a sad thing. It's of course a sad event for anyone to sustain a brain injury. But if he used his own techniques and they provably lead to recovery, it should be a moment of joy and triumph. His work was not wasted and he helped himself - what could be better than that?