"I don't know who this guy is, then he just came up and hit me. He didn't say anything - but I was hurt quite badly so I started to yell for help."
Zhu said he's not sure whether or not he was targeted because he was born in China, although he's heard of other racially-motivated attacks because of tensions around the Covid-19 pandemic.
But he said in his 20 years living in the city, he's never had anything happen quite like it.
"It's very strange."
Zhu said he needs to go back to his GP for a check-up, but his eye is recovering well.
"My left eye's still a little swollen, but I'm still struggling to sleep. I have a headache every night."
In terms of going back to work, Zhu said he feels a little nervous.
"I think the first day I have to go out, I'll be a little more aware of noises behind me.
"But I'm glad he's been arrested so the justice system can deal with him."