Having a myriad of doppelgangers was an additional ability of the Einherjar's body. It allowed Watson to release his counterpart, who possessed half of its owner's power. Watson had never used that ability after obtaining it because the doppelganger would be useless in a one-on-one fight. If Watson had to control his doppelganger in a large battle, he might as well spend his energy creating a few large-scale spells.
Those were all his previous thoughts, but he had changed his mind. The current he was controlling was like his doppelganger. He was controlling the current to separate and fuse; it was just like how he controlled his doppelganger to do different things without interfering with each other.
With that realization in his mind, Watson activated the system fusion with all the knowledge he comprehended.
