"Ahhh" Evian yelled and sent a Cosmic attack at San who deflected it with another slash of his Saber while wondering why it was so weak. Only to see that there were more being sent to him by his former right hand.
Evian had reduced the intensity of the Cosmic attacks so that he could send multiple of the watered-down attacks consecutively.
While they were weak, San still swiped them aside with his Saber as they were sure to hinder his vision should they make contact. Not in the lethal sense of course.
Just like throwing sand in someone's eye to obstruct their sense of sight and take advantage. Except for that sand to the eye of a normal man would be far more effective than the Cosmic attack to San.
That said, San knew that any lapse in concentration was what Evian was after and he did not wish to give him that.