Yes, indeed, Eric was plotting and scheming. And at last, he had the answer that he sought. If he could not defeat his foe by killing him, then he would have to defeat hi foe by sealing him.
As he had the ability to remotely control shadows that were not his own via the curse, even from within the pocket dimension (for how else could he return to the land of the living?), which Ichirou would soon realize, then all he needed to do at this point was to capture his foe. Though there were two shadows of which Eric had control over, he knew that only one of them belonged to the original.
No matter. Although it would take more of his chakra, he would be intent on capturing them both.
Taking into account the earlier usage of chakra, Eric would need to either succeed or work on restoring his strength after this; success, hopefully, would be the result.
By utilizing the very shadow attached to their bodies, Eric would open the gate of shadow and attempt to drag and seal them within their own shadow. Due to the overhead cloud cover and the occasional strike of lighting, at the strike, the shadow of the cloud and of the individuals would be very distinct. It would be then that the gate would open.
Noroi kagemane; Cursed Shadow Manipulation
When the lightning began to fade, the shadows would begin to merge again due to the differing source of light. It would be at this point that Eric would attempt to drag and seal his target. The speed of this sealing would be as such that not even Kamui would be fast enough to transport the entire body in time (not that it would matter, as even with Kamui one carries their shadow with them)
Fūinjutsu: Kage Naraku Rō; Sealing Technique: Shadow Hell Prison
If successful, then Ichirou would be sealed in the shadow of the cloud, appearing in the Nara realm completely bound, restrained, and effectively sealed off from action. It would practically be the end of the long, drawn out battle that the two had been waging for the past few hours.