Lind had been surprised at how tired he was later but he recovered very quickly as well. What he did not grasp was what was exhausted compared to what recovered. He saw all 18 elements flow into him as he recovered but it was not like there were any organs or other structures to recover it to.
His existence did not flicker anywhere so he had to assume a soul consumed Qi as a whole but he had never seen a soul recover with the few he had interacted with for a long time.
The ancient dragon souls had spent their strength but he could only recall them becoming very weak or dying entirely afterward.
The only human soul he had met did not count as it had tried to possess him and he killed it with karmic retribution.
Yet even that being was reluctant to exert themselves. He confirmed the spirit world was a place souls could thrive!