Arthur stood up rapidly as Mariana entered (like Potter in the 6th movie). He gazed at her. He did not know she was a member of the Order. He then bowed slightly and offered her a seat next to his. He was in a way happy that she was here, but he also deduced that Jess was the one she was talking about. (in between her standing and sitting, this situation has happened *Yoda style reply*)
Wilson looked at this whole situation with great interest. ''It seems that we have a slight problem'', he thought for himself looking at Arthur and greeting Mariana with a nod. He turned to Ne'os. ''Why Mr. Emof, hello. You are my N.E.W.T. student if I remember correctly. Your classes are very interesting. A detailed view on Muggle Society. But you'll see. Just, do not forget to attend classes'', he said to Ne'Os with a polite smile. He did not even notice Ne'Os was there until his colleague came. He never tried to remember his students that much so he remembered his name only when he greeted prof. Adeagbo. ''Professor, good day'', he greeted professor Adeagbo with a smile. Well, she was his colleague.
He then stood up. ''You will have to excuse me for a moment'', he said standing up. Arthur looked at him confused. He exited the room and saw where Matt and Jess were. ''I'll be brief lads! You just be careful what you are doing. Except Mrs. Diggory and you, Mr. Potter, there is a third person at stake here. Just be careful what you do and what you say'', he said and walked forward. He just took a short walk around the house so that the ones inside would not suspect where he was. After a few minutes, he returned back to his seat in the kitchen.