re: Poker & $10 NLHE 6-max: Resteal wiht AK from the BB... Button 4bets 40% of his stack.
It really isn't all that simple "ship it" stuff. I love the picture though.
It comes down to how tight he is, as Stu said he has to have some AQ or some JJ he'll fold there, otherwise your fold was correct.
If he only 4-bets QQ+/AK (or even TT+/AK for that matter) and always calls them you need to fold. You need almost 44% equity if he never folds and you just don't have it with AK. Up to you to determine how tight his 4-bet range is, at 5nl I think they can be pretty tight.
On the other hand, if you're the one that's 4-betting always call a shove because you're getting better pot odds
now. Just for future reference.