Ruby, Ren, Nora, and Jaune are all confused about this, but Grievous is mostly confused about how this kid knows about Ozpin.
Oscar: Just so you know, I'll still be here.
Oscar(Ozpin): It is so very good to see you all again.
Jaune: Wait, what just happened?
Ren: Professor Ozpin?
Oscar(Ozpin): Correct. And though I may be the one speaking, Oscar is still present mentally. He's merely handed over the control, so to speak. I'm afraid this all must be very perplexing.
Nora: And alarming, and bizarre, and just really kind of hard to believe overall.
Oscar(Ozpin): It's good to see you children still have a scene of humor. I know you've all be-
Grievous continues to have a hard time believing that the kid is Ozpin, Grievous mind thinks as of how this happened only for him to get frustrated and stand up.
General Grievous: If it really is you Ozpin, then prove it.
Grievous pulls out one of his swords
Oscar(Ozpin): In due time General, after this I talk to the children.
Grievous decided to wait outside and as an hour passes, Oscar and the group appear to watch this.
Oscar(Ozpin): So you are still having a hard time believing?
General Grievous: We will see!
Grievous pulls out his two swords out and Oscar hold on the his weapon, as the wind blow by Grievous rushes at Oscar.
I hope you enjoy reading so far be sure to share this story and I hope you all have a great day and may the force be with you!