Joe has no memory of killing Malcolm. He begins to spiral, questioning his own sanity. He thinks, Did I black out? Did I kill him because he was annoying? He fears that his "Joe" persona has taken over and he has lost control. He panics and considers turning himself in.
Joe returns to his apartment, feeling defeated. To his horror, he finds (the colleague from the party) dead on his kitchen table. Malcolm has been stabbed. you s04e01 aiff
"Joe Takes a Holiday"
The next morning, Joe wakes up in his apartment, hungover and anxious about the fight the previous night. He rushes to the university to teach his class. However, his focus is shattered when he spots on a bench on campus. Joe has no memory of killing Malcolm