Zhao Yi also met Thomson, Phil, and others, mathematicians he had known from the conference. He politely went over to exchange pleasantries, and along the way, there was plenty of admiration, but no one questioned whether they had completed the Riemann Conjecture.
Because...
Failure would be the big news!
Zhao Yi's mathematical achievements were too numerous, his fame in the mathematical community too great. The fact that he and Edward Witten had completed the proof of the Riemann Conjecture was indeed astonishing, but the astonishment stemmed from the completion of the Riemann Conjecture, not doubts about the proof being incorrect.
If the report on the Riemann Conjecture failed, many people would feel their trip had not been in vain, for they had witnessed Zhao Yi's failure.
This was much more interesting than success.