Ayo - the White Walkers are food out here if their opponent has dragonglass or Valyrian steel. Jon made quick work of ol boy, and Jon is not the best fighter in Westeros. To be fair, I don't know if them five dudes on the horses, including the Night King, have additional abilities. But if it's a fair one against a human w/ dragonglass/Valyrian steel? Ball game
Idk bro the night king himself seems to have super human capabilities after that spear throw. Maybe Jon can kill his generals but he's gonna be that ultimate boss u see in rpgs with 99999hp