In this hand that you are both arguing/debating about ICM is a huge factor in deciding what we should do with our hands and our stacks. Whilst I won't run through the math on here I will post some images for you so you can see shipping hand ranges and such. Bear in mind I have assigned a bubble factor of 1.2 (I am correct in assuming we are two spots from the money?)
This is where ICM comes into play; I would suggest that Harps is limping with 12 - 25% of hands and will call a reship with 7.5% of hands. Do not be results orientated here (we all know he had AQ), but you need to ask yourself what RANGE of hands would Harps be limping here. And if I reship what percentage of hands is he calling with.
PLEASE NOTE: in the below spreadsheet I have assigned Harps a 7.5% calling range, the further we move this range out the more +EV it is to ship in this spot.

- This spreadsheet is for cEV calcs. And shows that reshipping against Haprs and Larx is +EV with ATC.
- cev calc joHarps.png (130.29 KiB) Viewed 758 times
It is +cEV here to reship with ATC, what this means is that there is long term value in shoving with ATC against Harps calling range as we will generally win more chips in the long term. And it isn't even that marginal as we will generally win 7% more chips over a long period of time, even with the worst hand,7,2.

- Here we involve the Bubble Factor and calculate our ICM equity and whether it is +EV to re ship in this spit
- ICM calc joHarps.png (135.39 KiB) Viewed 758 times
In the above spreadsheet we calculate whether it is long term +EV to reship here via ICM. In this method we Independant Chip Modelling and the bubble factor is taken into consideration.
As you can see, once again it is long term +EV to reship ATC against a limped range.
In the above scenarios/spreadsheets though it does not take into consideration two callers to the pot, and therefore does not include the inflated pot size. Even with this information in hand we know that more chips in the middle make it even more +EV to reship here, especially with an effective stack size of 9BB's.
I hope the above helps, but breaking down the math for cEV, ICM and Bubble factor calculations will not be prudent as it is long and involved but I will make some brief explanations.
BUBBLE FACTOR = is basically a ratio of pain to win ratio if you lose a hand at that stage, considering we are two spots from the money and the short stack the pain wont be that great to lose here.
cEV = equates to how much equity we have with out chips and standing in the tournament and how that increases and decreases with our stack sizes.
ICM = uses cEV to decide whether calling, shipping, stealing with our stack is +EV and whether it is even worthwhile to risk our ships when we know we win the majority of the time.
I understand completely why you got frustrated in this discussion Jo, and I hope the above plays some small part in helping bridge the gap between what benny the cunt was trying to explain and what you were hoping to see.
I don't know how better to explain it all without breaking down to a very mathematical level. And show all the steps in calculations.