At first they were sustained through them down below. This is evident from the fact that with the ascent of the legs, the vessels also ascend. We thus infer that they had some dependency on those legs. We see that as long as the vessels needed to be kept below, the legs were down below and radiated to them, and when the vessels had to rise up, the legs of Arich Anpin were folded up. From this we can understand that the vessels are dependent on these legs, as stated above. When the vessels had to stay below, the legs were below and shined in them. And when the vessels had to ascend, the legs were folded and the vessels ascended after them.