Well, different people have different ideas on what hands to 4bet bluff with. I usually like to include hands with blockers so like AJ/AT/KQ/KJ/QJ etc. I mean SOMETIMES 4betting/folding 22 is betting than folding to his 3bet as well as 4bet/calling. It depends.

I rarely rarely flat 3bets OOP. I know much better players than I will ever be are the same way so I guess I use more hands to 4bet bluff than call. But it depends again. Sometimes I never have a 4bet bluff range. I'm getting off topic.