27 Adar (pesach)

Yesterday we quoted the gemarah in Pesachim 108a that says that there is an aurgument if according to Rav Nachman you lean by the first two cups or the last two. In the opinion that you lean only by the last two because we're only free by the last two but by the first two we're still slaves (the other opinion), how does that make sense? By the second cup we've already finished maggid so we are free. Why are we calling ourselves still slaves by the second cup?