From what I was able to understand...
He has some sort of prior history of being invovled with the people and is a favored protector under Guanyin... after enlightenment and becoming a protector he remained rather recluse.
He is said to lay with his back on the mountain with his dragon staff to his side.
He watches in solitude as people pass by... he intervenes when travellers are preyed upon or if he witnesses injustices.
He is intolerant to the strong abusing the weak.
He requires no thanks or prayers... prayers should be made to Guanyin.
If I ever (and I'm sure someday I will) learn more of him... I'll post it here.