Pak Lah said that he would not be meeting Anwar on Anwar's offer on showing him the 'proof' of defections. Which would thereby force Anwar to bring the 'proof' to YDP Agong.
When the YDP Agong then peruse the 'proof', he may have no choice but to call for the dissolution of the parliament and to call for a snap election. But then everybody knows that in the next election, BN would be wiped out.
Which would then give Pakatan Rakyat the Federal government without the worry of the ethical dilemma of governing with 'jumpers'.
Think about it, Anwar knows months ago that Sep 16 is during ramadhan and that parliament would not be in session. And taking advantage of BN being the 'bad guy' (which hollywood shows us that the bad guys are prone to double crossing and backstabbing their own brother-bad guys just so that they would be able to take control of the organisation and rule the galaxy or something) which translate to BN's natural fear of double crossings and back stabbing from within their own ranks, to compound upon Pak Lah's paranoia that he really is under siege.
And with the best way of calling the bluff by moving a motion of no confidence unavailable due to the parliament not in session, everyone would give Anwar the benefit of the doubt and believe what could possibly be just some letters with some signatures on it.
Now, if Pak Lah were to meet with Anwar, he would be able to somewhat ascertain the validity of the list of defectors. By looking at the list of names, he may be able to recall if that someone have been acting strange or maybe look at pak lah in some sort of funny ways or that he had on occasions seen the particular MP winking at someone before
and that the MP treats Pak Lah especially nice to make up for the guilt of betraying him.
But no. Pak Lah is too afraid to call the bluff. By being afraid he is actually folding his hand and letting Anwar take the pot. And soon Anwar would go to YDP Agong and again because the parliament is not in session and due to Pak Lah having chickened out, the benefit of the doubt would be given and a snap election would be called. BN would then be defeated soundly and everybody lives happily ever after.
Then maybe a few years later, Anwar would be giving a speech on Malaysia Day 16 Sep 20xx that the country was freed from the clutches of BN because a certain somebody chickened out and did not call his bluff.
Later on his deathbed, Anwar would then let it all out that on that day 16 Sep 2008, he actually have less than 10 MP defectors but because someone is too chicken to call his bluff, he brought down the goliath just by his exceptional poker face and would then give his very stale(at that time) joke of "Tengok ini muka. Saya umur 90 tapi muka nampak macam 60"
But then again, if parliament convenes and vote of no confidence on Pak Lah goes through, Pak Lah would have lost the ability to utilise the power to crakdown on Pakatan Rakyat.
So how now Pak Lah, crackdown now and risk being extremely unpopular and losing the government slowly but surely? Chicken out and risk gracefully losing the the government in a short time? Or meet Anwar and risk being suspected by your own people of striking a deal with Anwar?
See, actually i think BN is overwhelmingly out maneuvered by Anwar and for every move Anwar make, BN is stuck with moves raging from bad to worst. And then come Mahathir which is coming to eat Pak Lah up if he refuse to move.
Sudahlah. If i am Pak Lah, i would quickly strike a deal and call it a day.