Tom Cruise's death was completely unexpected for Fang Zheng. Although, to be honest, Fang Zheng didn't have much affection for this world, Tom Cruise played a hero after all. So Fang Zheng intended to have a good talk with him. However, as soon as Tom Cruise heard him mention the word "ability," he decisively shot himself. Fang Zheng guessed he was afraid Fang Zheng would dissect him... Well, it seems some habits aren't always good.
The protagonist was already dead, and Fang Zheng could only mourn for three seconds. What else could he do? The other party wanted to die, and he couldn't stop him.
With Tom Cruise's death, the whole plot of "Edge of Tomorrow" was surely ruined. However, Fang Zheng didn't care. He never planned to follow the protagonist's route, so whether Tom Cruise lived or died didn't matter much to him. In fact, it didn't matter much to humanity either because, at this point… the situation couldn't possibly get any worse.