Asuras's uncle boyang tells us that if the bear gets involved in the battle, then he's certain that the bear will capture and kill sura in two weeks. After that, he says, the bear's going to have a lot of ways to make asura confess who he really is. If he runs away, then the bear is going to kill him without hesitation. He'd rather die than live or to be killed, says the uncle. When they finally get to the bear, the uncle tells them to open the trunk and find out who the killer is. The uncle says that he originally planned to invite the bear and Kate to a debate to decide who the mastermind of the masked killer was, but that he didn't think the bear would catch the killer first. If the bear were the mastermind , he'd have a simpler way to kill the people. So it looks like the uncle's guess is correct. He says that since the bear allowed small laboratories to exist in the white river, reputation is what's most important to him. That's why, after submitting to him and handing over the technology to him, he doesn't plan on being killed.