Honestly I'm a bit surprised by the range you give to the shortstack here.... I mean the blinds are only 100/200... so how do ya figure they're shoving a weak Ace otb? They don't 'have to' shove here at all (risk v reward... they win blinds the big 300.. they shove wide & lose.. they're out... having 2900.. or ~2600.. not much difference for them in that spot). If blinds were 150/300 I'd think differently. Not sure what range I'd put them on (I wasn't on the table)... imo shoving weak Aces isn't the hand I'd want to be getting it in with (hands that call you will often crush you).
As far as 'what do I do once SB shoves? Again it depends... but I'm pretty sure I'm getting it in here with the AK all day long (mostly because we're gura. 3rd if SB takes it down). Of course we could get into a situation > SB has AK/AQ and some of our outs are cancelled... and BTN has 33-JJ & triples up, lol.
Do you try to put players on ranges?.. or work out equity equations? just wonderin'?
Brad Booth - > "Like a fight... it's not how you start, it's how you finish"