His wife, Cong Cong Hu, stepped in and tried to help, the surveillance video shows.
“I was so scared. What if the guy go crazy, have a gun or knife? I don’t know what would happen, so I’m so scared,” Hu said.
Lu had to go to the hospital, where he got 14 stitches.
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The family said the attacker ran away and has not been arrested.
Lu said he hopes to see police make an arrest and that he’s tired of seeing Asian Americans get attacked.
An investigation is ongoing, according to D.C. police, who said they are treating it as a possible hate crime.