Yi Bing, Huo Ling, Jiu Ye, Bai Wu, Shi Jiu and Shou Ji fell silent as they looked at each other. When they heard Feng Er and Lili said that they blew up the laboratory building, they were stunned. After all, the grim reapers aren't allowed to harm the mortals, especially killing them. So, they can't believe that Feng Er and Lili would kill the researchers, too.
But, it is different when it was stated on the Death Note that someone will die. So, that explosion that Feng Er and Lili caused is the fate of those researchers. Thus, Feng Er and Lili didn't kill them. It was their fate instead. That is, to die in that explosion.
However, it seemed that one of them has slipped away? Feng Er and Lili's goal was to end the demonic research and destroy everything related to it, thus exploding the laboratory one and for all with all the researchers inside it. Yet now, they found that one of them might have lived…