On top of a bed, Yasuo's Qi and blood circulated within him, merging into one and integrating into his body. His full concentration was on this final step.
In order to heal his injuries with the Frostbone Ashe, he had to smash it into small pieces and eat it all together. Then, he needed to slowly merge the blood that absorbed the healing effects and integrate it into his qi so that his injuries would fully heal.
At this moment, he lifted his foot to enter the final stage and finish the process. The black veins running rampant inside his body were slowly calming down, their colors slowly but surely changing back to normal.
Through a night of comprehension and reading the system's instructions, Yasuo finally understood how to merge and integrate both into one.