Well, he had decided that he will meet Salman Khan (Arjun finally ready to face Salman, Jan 22) in the Bigg Boss house and informed Colors about it. So the programming heads had burnt their midnight oil and chalked out a scene for them.
But Arjun changed his mind when he entered the house yesterday. Sources say that he simply froze, regained composure to shoot for his individual scene, and then made a hurried exit via the back door. 
Image Source: Manav Manglani