More specifically, it related to "sense of distance"—spiritual energy.
The less familiar and more "distant" the thing was, the farther away Bad Day could reach it.
Besides that, this spiritual energy had certain limitations related to the weather in his current region, but Bad Day did not share that part with Russell.
The reason why Bad Day didn't tell others about the effects of his spiritual energy was because if someone knew his secret, and he knew theirs, he wouldn't be able to use his spiritual energy to harm them or defend against their attacks...
—Just like Russell's father.
It was precisely Qiao's betrayal that caused Bad Day to stop trusting others. After Qiao's betrayal, only Russell was privy to some of the effects of Bad Day's spiritual energy.
With Bad Day's protection, should they encounter such an attack again, he could at least ensure Russell's safe transfer.
So, although Lin Qin was still somewhat afraid and fearful,