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The lectuer talks about the several reasons cited by critics who have opposed the idea that the fine lines found around bones are feathers. She says that the reasons stated in the passage are very different and somewhat inaccurate from when compared to the reality.
Some critics reason that the fine lines may be fibers which are formed of decomposed skin after the animal's death. However, the lectuer believes this theory is not applicable. She points out that skin of other animals has been found intact in the same site, hence it's not robust to suppose that only the skin of dinosaur could be decomposed. This directly contradicts what passage indicates.
Besides, the critics also debates that the fine lines may be other part of the dinosaur like frills, even if these lines are remains of real structures of Sinoaruropteryx indeed. But the lectuer provides evidence, which is found by scientists, that the chemical content of feathers can be distinguished from that of frills according to specific protein that only belongs to feathers but not to frills. This is another dimension that indicates the theory is not tenable.
Finally, it is proposed by these critics that feathers are useless for dinosaur on the basis of the fact that feathers usually serve to help fly or regulate internal temperature but the lines are mostly located along the backbone and the tail of the animal. Nevertheless, the lecturer thinks this explaination is ridiculous because the critics have negleted the possibility that the feathers on the backbone or tail can be harnessed to attract mate. Therefore, it's cristal clear that the viewpoints of the critics are completely fallacies and the probability is quite high that the lines are feathers of dinosaurs.