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I wish he would tell him: "I don't want to say too much, because I might remember it wrongly, and then you might accuse me of something based on a mere mistake, not what you would perceive as tailoring my story."
This is why I don't like Nel's methods. He well knows that NO ONE can remember all the details of an event that happens in a flash over a year ago all that well, and that they may well in all innocence state things that never happened if you go into minutae, and so I find his arguments spurious and disingenuous. In the hands of a cunning prosecutor such as Nel, someone as young and relatively naive as OP can be made to look guilty when he really isn't, and it takes a good judge to see through all those theatrics.
Something that always struck me as strange for this trial, is the long winded answers provided by OP.
He would be much better off going with the 'I don't recall' line that most people use.
Its simple and leaves nothing for Nels to cross-examine on.
Surely Roux told him that but maybe its different in South Africa
You make a good point and I would like to agree with you, except for two things I humbly disagree. Firstly if he had outwardly taken responsibility, it would have caused a huge stink in the media because in SA he is a (in fact he is their no 1) celebrity, whereas his friend was unknown by comparison. As OP offered to pay for the damages and paid the bill itself, he effectively did take responsibility to put the matter right. As no one was hurt in the end, it wasn't a case and there was no question of taking responsibility for someone's life. Besides, there's a different between taking responsibility and not wanting to be all over the news. So I can see why he might have sought to have avoided the public glare while still privately making amends.
On the other hand, he didn't seek to avoid responsibility for Reeva's death, so clearly not taking responsibility isn't his issue.
Secondly, Kelly Phelps of CNN pointed out that the defense will not have finished with that issue yet. In OP claiming that he didn't have his finger on the trigger, the defense is merely setting up the skeleton of a future defense perhaps with expert witnesses who will counter Nel's claim that the gun could not have gone off by itself or do something along those lines.
I will withhold further discussion on the above until the Defence presents their case re: gun firing by itself. I think it will be a tough sell though and he should have just pleaded guilty to that charge.
I will just quickly note though that the manager for Tasha's refuted OP's claim that he offered to pay for damages.
Edit: Both the restaurant manager and wife denied OP offered to pay for damages
http://juror13lw.wordpress.com/2014/03/06/oscar-pistorius-trial-day-3/