Baird had been living off of Zavier for a long time. Whenever he needed money, he would stop Zavier in his way and would rob him of everything that he had on him at that time.
Zavier had become a sensation worth fearing before he had gone on the mission that almost took his life. The students had been both curious about him and afraid of him at the same time. There was a lot of attention on him for his superior prowess and battle capabilities. Baird at that time had never dared to show his face in front of him for fear that Zavier might return all that he had done to him over the period of time.
Yet as soon as the news of his failure spread, Baird gathered his guts once again. He thought that the lucky period of Zavier was over and he could be exploited by him once again.
As a result he confronted Zavier as he was going towards the class. He blocked his path and started to move towards him in an attempt to push him back towards the corner of the corridor.