The Silver-Armored Zombie was a mutation from the normal zombie species, and it possessed unique characteristics that set it apart from other zombies. It could infect creatures into a Silver-Armored Zombie, regardless of whether they were evolved beings or not, as long they were injured by it!
Tang Ye had firsthand experience with this during his journey to Yunchuan City. His copy had wounded many people on the way, all of whom, whether they were New Humans or ordinary people, ended up turning into Silver-Armored Zombies.
Therefore, Tang Ye had deliberately remembered the evolved leopard and other evolved beasts who had been scratched by Silver-Armored Zombies.