After being attacked by any player, the system will send a message saying that XXX has attacked you. The first time around, Unstoppable Thunder was the one who had attacked Wang Yu so he didn't find out Wang Yu's name.
Only after he had died the second time did Unstoppable Thunder learn his killer's name.
Peerless Heaven wasn't a guide based in Twilight City so naturally they wouldn't read the Twilight City forums. The only times they came across Wang Yu's name was when it appeared on the world announcements.
"Quan Zhen Sect's Iron Bull? So it was him… Hmph! Does he dare to f**k with our Peerless Heaven? These dogs really don't know what's death!" Unstoppable Thunder spat as he opened the guild chat and sent a message: "Boss there's a bastard in Twilight City that's disrespecting us and he's an expert!"
"Oh? An Expert? How good is he?"
"The kind that can fight ten alone!" Unstoppable Thunder replied.
