For one thing he is going to get to see your hand and he can call you a w*nker if you have crap and the ai player survives.
This is actually a significant statement by doubleup. It is because of this that your oppo isn't usually going to treble the all-in bet with anything he is going to be ashamed to table.....
HE doesn't want to look like the w*nker!...who keeps the ss alive around bubble time. He also has the aggressive CL behind him AND it's bubble time. Make no mistake, he is not bluffing here.
As the CL, if you don't put your chips in aggressively and you're not trapping then why would you put your chips in at all?? Why would you even entertain calling with a medium pair, oop, around the bubble, against an oppo who has a hand and plenty of chips??
Yes you COULD push, but why? If you have just eaten a big fat steak and you're full you would turn down a curry. That doesn't mean the curry isn't nice, or you could murder one on another day, just that there's no immediate need for it right now. Just like playing the 10's.