The duplicate went on to rescue the others. It was very crucial on his part to rescue the students of his original. Bearing the copy of the soul of Lumiel, he can feel the same worry and fear of losing them.
Not a single wasted moment was made so he teleported to their locations. He first arrived at Ben and Gladden. Having seen the two of them almost surrendering their lives but they were rescued by Lumiel's Rogue [Shadow clone].
Duelling the ghoul but it was in disadvantaged. Only making cuts on it and the ghoul seemed to regenerate. Having been able to fulfil its purpose to buy time made Lumiel's duplicate to be glad.
Even more so, he will be punished if the students were dead. With the clones split into four. It made also their vitality, defence, and durability to be split into four.