In what circumstances has a defendant been convicted of assault after smoking a cigarette laced with PCP?

In People v. Velez (1985) 175 Cal.App.3d 785, 221 Cal.Rptr. 631, the defendant, after smoking a marijuana cigarette laced with PCP, crashed into a house by kicking open a locked wooden door and viciously attacked with a screwdriver a 64-year-old man watching TV who he didn't even know. He stabbed the victim all over his body, including his eyes. When the police arrived and pointed a gun at the defendant, he continued to try and stab the victim until he was forcefully subdued. As a result of defendant's attack, the victim was partially blinded, his hearing impaired, his legs are stiff and he has no feeling in his left palm. The defendant stated that he smoked marijuana offered to him at a social gathering not knowing that it was impregnated with PCP--that after two puffs, the people in the room began to look like devils. After that, defendant only remembered running and screaming.