[hansarnic]

What does he think you make of his PF limp?

Something small & speculative that wants to see a cheap flop? You don't raise or push PF either which also gives some definition to your range of hands.

So when it comes high he will probably think that you think that it totally missed him, and thus you may well push with any two. Hence I suspect he thinks he's ahead a good portion of the time here.

BTW, would you push with top pair or try to induce a steal from him? I would expect many to do the latter, therefore suspect he may not read you for top pair, further reducing the hands he's behind.