Man Who Taught Pistorius to Shoot Takes the Stand

Receipt shows that Sean Rens sold the Blade Runner weapons that include an assault rifle.
3:00 | 03/18/14

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Transcript for Man Who Taught Pistorius to Shoot Takes the Stand
Right to the latest in the Oscar Pistorius trial right now. ABC's Matt Gutman is at the courthouse. Good morning, Matt. Reporter: Good morning, robin. Over the past couple of hours we've obtained new documents that reveal so much more about Oscar Pistorius' weapon training. We know he was a proficient marksmen. This is his target sheet and received assault and tactical training and also know he answered up to 150 examination questions about using his firearm but in court this morning the focus all on the police. This morning, the defense and prosecution battling in court. I can take you back on the line. Reporter: Once again it's Oscar Pistorius' defense team questioning the police work. In this case, the hundreds of police forensic photos. The judge rapping his team for badgering the officer who took these photos the night Pistorius shot his model girlfriend reeva steenkamp in his bathroom. It cannot be put -- You cannot argue with this witness. Reporter: Just this morning, ABC news obtained a trove of documents from a justice source including this target sheet showing Pistorius' shooting prowess all so close to the bull's-eye. The man who taught him to shoot on the stand. That's a smith & Wesson 500 model. Reporter: This is the receipt showing the small arsenal of guns he sold him including a 50 Cal handgun. ABC news obtained several of the actual copies of Pistorius' firearms license exams. He aced them getting 96% of the answers right on one of them. And overflight we've learned that his assault rifle license was obtained in early 2013. This test he took in 2013, weeks before the shooting. Correct. Reporter: Andre Pistorius largely designed this set of exams posing hypothetical questions that the blade runner got right. That's Oscar Pistorius' own handwriting delineating the guidelines for the use of lethal force and writes" it's permissible if the attack is against you. It must be unlawful, must be against the person." You're saying that he basically broke every rule in this book. Pretty much by his own answers given in court today, I think that that cape as a big surprise to the general public because everything he put in there he got the answers correct. Reporter: It may be one reason tensions remain high here broken briefly with what seemed a moment of reconciliation. His sister Amy stopping to talk to reeva steenkamp's mother. Over 100 names long through 12 days of trial only gone through 14 of them and that's just 9 prosecution's case. It gives you a sense of the scale of the complexity of the mystery in what really happened to reeva steenkamp that night and, robin, we're told this trial could go on for weeks, maybe even months. I know you're going to be there for us, Matt. Thank you. Here more on this chief legal affairs anchor Dan Abrams. The impact of the firearms expert, what was it? Absolutely crucial. It shows that Pistorius knew better. He knew he's not allowed to shoot behind that door. Even if, even if he feared there was an intruder. That is really important because if the judge has question, let's say the judge is saying, you know what, I do have doubt as to whether he thought that maybe there was an intruder, maybe I will buy that as a possibility here, this sort of testimony seems to ensure that he gets a conviction on a lesser conviction of culpable homicide. What does that mean? It means that at the very least it was reckless or negligent action on his part. It wasn't a reasonable action on his part and that's why this witness, I think, is so important in the context of the case. Even that presuming it was an intruder it seeps from the testimony he had thought that Pistorius had thought that in the past. He even tweeted about it at one point saying I went into code red. Turned out it was my drier. Now, you could argue that that's helpful to his defense and shows this is the way he thinks. He worries about this stuff all the time and the defense is going to say and in this case he was worried that it was someone in the bathroom. That doesn't change the reality and, again, coming back to the firearms expert that it still has to be reasonable. But that could be the difference between murder and a lesser charge of culpable homicide. The defense keeps bringing up inconsistencies they say about photographs. About where items of evidence were so reminiscent of the O.J. Simpson case, exactly the same sort of defense we saw which is police bungling, they didn't keep control of the evidence, et cetera. I don't think that's going to be quite as important as some of the other things we've been talking about. You think it's going to be a lengthy trial. Absolutely. This is already taking far longer than expected and it's going to be amazing to see how long it takes Oscar Pistorius to take the stand if he takes the stand. Thanks, Dan.

This transcript has been automatically generated and may not be 100% accurate.

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