Someone rekt my Kog jg and I'm mad about it but maybe you can learn from it

Ok, the way Kog JG "works" is by using his fast AS to proc. the Krugs buff a lot on his first clear. This lets him clear fairly safely.

Recently, I was invaded and my Krugs got smited away but we eventually made him back off. However, I found myself almost unable to clear more than 1-2 camps without the Krugs buff and it got me thinking that invading Krugs mostly just to Smite it could be really annoying for many AA junglers without great sustain. Thus, if you're something like a Nunu who can JG safely regardless of Smite, this may be a good way to mess with your opponent and force a back earlier than they'd like. It's especially good vs Devourer junglers since they're trying to rush the item and delays hurt their power curve more.