He actually had his own speculations about the explosion, because he was certain that a particle transport event had occurred, and thus the particles that had been transported were very likely individual particles rather than directly atoms or molecules.
These single particles could be protons, neutrons, quarks—put a bunch of these single particles in a vacuum, and a combination reaction, that is, a nuclear fusion reaction, was bound to occur.
The absence of any accidents the first time was because the transported particles were air; under the neutralizing effect of air, the few single particles did not have an environment conducive to direct collisions, hence no explosion occurred.
In the middle of the meeting, Zhao Yi discussed this with Ruan Wenye and Yan Rong and shared his speculation, "Although what we observed may be a combination reaction of particles, I believe the essence of the reaction is the offset of positive and negative energy."