It could even be perfectly reasonable to treat each other as enemies, and a big fight between both parties would be quite normal.
Of course, if one enters the Void, using Spiritual Sense to scan is a very normal behavior.
In the Void, Spiritual Sense serves as eyes and ears, and also as a mouth, all perception and communication must be done through Spiritual Sense.
"Old Niu has no ill intentions, I was just passing by and sensed a Golden Core cultivator's Qi Mechanism, so I couldn't help but come over out of curiosity!" the Green Bull Demon King said.
He wasn't lying, he really was just passing by and happened to sense the Qi Mechanism released during Yang Zhenshan's previous battle, which prompted him to hide in the Void to see who was fighting.
Of course, this kind of behavior was still quite rude, so Yang Zhenshan's coming to hold him accountable for it was understandable.
"It was my impropriety, I ask for your forgiveness!" the Green Bull Demon King apologized sincerely.
