Laertes wrote:Maybe is just so fast that it doesn't matter if you don't exactly follow the score? Is this what you think?
No, it's not entirely because of that. Letting the notes ring beyond their written durations and on top of each other is something called 'arpeggio'. The problem is that it isn't easy to tell when to let the notes ring and when to mute them just by looking at the score, as it is largely dictated by guitar playing conventions. Some things simply will sound 'better' done in certain way, because the way we're used to hearing them. There probably are some rules, and lot of exceptions to them, but to understand those rules would require a deeper understanding of music theory. For beginners it is easier to just listen to more experienced players and try to copy what they do.
It's also worth noting that the rules are not absolute. Some people prefer playing some parts in different way than others. In this case it's not wrong to mute all the notes after their duration, but it will make playing the piece unnecessarily hard for 2nd year students, and in my opinion it sounds better to let them ring until the 3rd beat. In general professor Delcamp marks with the flower symbol all the places where he thinks students should use damping for open strings, but in this case it has been omitted from bar 9 3rd beat either by mistake, or perhaps he feels that it makes playing the piece too demanding for 2nd year students.
Besides the E's and G's in bar 9, I would also let the D's and G's ring until the 3rd beat in bar 10. And the same goes for bars 17 and 18, where the exact same pattern is repeated. Professor Delcamp also plays those bars that way in his video.