When Lucas mentioned 'He', Belle didn't know who he was reffering about. There were a number of possibilities of who it could be. She heard sound of the footsteps approaching the room. Belle couldn't stop but look in anticipation of who it was. Like the rest, she had taken hold of the scythe, bringing it in the front and ready to defend herself if she could. Lucas pushed her behind him and this only made her more worried.
"Seems like our luck ran out," commented Rower who was still holding the girl's soul in his arms.
The sounds of the footsteps got louder and Belle finally saw the person. In reaper form, the person's footsteps felt heavier as he stepped inside the room for the others back away.
"Well well well, I thought I smelled something familiar but didn't expect to see three Grims in here," the person then shifted his sight to look at Belle, "And the newly created reaper."