I'm not at all convinced that North can read anything into the raise by South.
I used to play that such a raise showed a non-minimum, in that all minimums would pass 1
♠. But then I noticed that the opps never passed out 1
♠...
Sometimes they'd find a magic fit and be able to make 3-red suit, and other times, they'd be -50 in 3 red when we were cold for 110... and don't tell me that we can push the board by doubling a close partscore into game
So now, I raise as third hand with any hand with which I would have opened in 1st or 2nd, and this means that responder needs a touch more, than he has here, in order to make a game try.
Opposite AJxx Ax xxx A10xx, the same high card strength, and the same shape, and we have no 3 level safety. And, using the approach I have indicated, he needn't be that strong.
Note that whenever South is 4=2=3=4 or 4=3=2=4 with a minimum, the opps can almost always make 2 or even 3
♥, so passing 1
♠ with a hand such as this, but weaker, is losing bridge.
So, this is another missed game for me, unless I was in Heat One, where everything we bid makes.
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari