Concerning possibility

Now that Cassian was confident nothing would go wrong if he rotated the mana, he sat cross-legged in the middle of the lab. Rowena, still waving a variety of magical instruments around his body, observed what was happening inside him. Using her tools, she formed an exact replica of his body with golden light strings. Some of these strings glowed brighter than the rest, starting at his hands. Gradually, the glow began to seep into another golden string, moving into his arms, taking the form of thin, luminous threads. These threads flowed through his veins, mimicking the circulation of blood.