Yes the first officer on the scene fired his tazer at him while at the same time the officer who came as back up fired his gun on him. The first officer called for back up when he saw the stick/pipe in his hands. He had more than enough time to hear the neighbors telling him that the guy was deaf.
They are supposed to know because his neighbors were screaming it at them.
The neighbors were probably afraid they might get shot from the cops if they tried to intervene. They were already telling the cops that the man was deaf and the cops still continued to treat him like a hearing person.