So this was the first oxidation step, and this is the second oxidation step. And in this particular case, the molecule that is basically abstracting those electrons is not Fad, but it's NAD plus. So nicotine amide, adenine dinucleotide. And so the NAD plus extracts two electrons as well as an H ion, and it forms the NADH. It also releases an H plus ion. So essentially, the NADH molecule grabs this H atom along with the two electrons, and that releases the H plus ion, and that forms a double bond between this oxygen and this carbon.