My thoughts and reasonings behind this play, I am the 50 year old nit in question, not 50ish, 50 is bad enough.
I think if you 4 bet me smaller I would of been more inclined to set mine, I don"t think I can set mine with the stack sizes as they were, also if you 4 bet me smaller it would make me a lot more wary of a possible monster behind, a year ago I probably insta fold, perhaps i should with 2 short stacks still in and it being the cash bubble, but thought the insta shove would indicate massive strength, if I took my time with the shove I am fairly sure you would call.
If you have AA or KK you want me to call so why so big that is my initial thought, I know you are capable of 4 betting light, and with your stack size I am pretty sure if I shove the lot in you can fold mid pairs JJ, AQ, AK against me even QQ, my insta shove obviously indicates massive strength, it is the cash bubble and although not massive money it has been a long day and I still would like to make a profit, like I said in the blog once you haven"t insta called I am certain you haven"t got AA or KK but am still sweating on JJ or QQ and didn"t really want to flip, this move was totally player dependant I don"t think I do the same thing against anyone else at the table, you still have 40 ish big blinds left if you fold, and you know there will be a better spot at the table.
If you did show up with KK or AA then fair enough, made a move didn"t work, go home kicking myself for not being a nit and folding to the potential cash.