Hmm... i'ma need to use stop-motion prose for this.
As matter distorts, Hawking sees Granny start to collapse. As her limp body and the rest of (frankly the solar system, but we'll ignore that) the arena is twisted to have infinite mass and infinitesimal volume, Hawking feels an odd sensetion. As the rift dissipates, a card drops to the ground. It reads, "I aint'nt dead."
All this happened in moments. After it was over, Hawking hears a clipped, elderly voice in his head. "Well played, Mr. Hawking. But if I'm going to go down, you can bet I won't be the only one."
The voice fades, and leaves behind only a faint tickling at the back of his mind. After a few moments, though Hawking experences a white-hot fire roaring through his mind, and he collapses. His body is still perfect (well, as perfect as some-one with Lou Gherig's can be), but his mind is irreparably destroyed, and rendered catatonic.
"I meant," said Iplsore bitterly, "what is there in this world that makes living worthwhile?"
Death thought about it.
"CATS," he said eventually, "CATS ARE NICE."
Terry Pratchett, Sourcery