>>64242360
>Armor isn't magic. You keep hitting it in the same place, eventually something that can't pen it can pen it.
NTA but with an autocannon against thick armor that kind of thing would take hundreds or thousands of hits without lottery-winning levels of luck lining up shots hole in hole. When you talk about "multiple hits weakening an area of armor" you're usually talking about something much bigger and even then it's a crapshoot.
It's probably the other option, it must have punched through something other than the main armor.