Yang Jian could be humble in speech, but he never let humility compromise his character. Speaking modestly was simply a way to avoid offending others and prevent sticking his neck out. But to be timid as a person would make it too easy to suffer losses and be bullied.
This Lin Long obviously mistook Yang Jian's humility for timidity, misjudging the situation due to his arrogant nature and failing to restrain himself. He took it upon himself to forcefully attempt a takeover of Yang Jian's Ghost Candle, even going so far as to openly threaten him.
After some thought.
When Lin Long's arm fell off his body, he realized something was terribly wrong.
Almost immediately, he tried to fight back using the ghost within him.
Without any concern, he didn't care if Yang Jian accidently got killed in the process. Daring to remove his own arm was like seeking his own death.