When Grand Masters play, they see the logic of their opponent's moves. One's moves may be so powerful that the other may not be able to stop him, but the plan behind the moves will be clear. Not so with Fischer. His moves did not make sense - at least to all the rest of us they didn't. We were playing chess, Fischer was playing something else, call it what you will. Naturally, there would come a time when we finally would understand what those moves had been about. But by then it was too late. We were dead.
Fortunately I've got a weak character, so I never did decide to dedicate myself to only one of my professions. And I'm very glad. After all, if I'd rejected chess or music then my life wouldn't have been two times, but a hundred times less interesting.
Tal's combinations often exert a sort of paralysing influence on the opponent's play. It would seem that the element of surprise plays a big part in this.