Grossman is injured in an accident. Jon makes the embarrassing assumption that a deaf man is just drunk.
Did You Know?
When Ponch attends to Grossman after he (Grossman) has rolled his motorcycle, Ponch takes off Grossman's helmet to reveal a large wound or bruise on Grossman's face. The strap from Grossman's helmet was covering part of the wounded area, but the wound is consistent throughout, so it can't be a scratch or any other kind of abrasion, as the strap would have protected part of the area or at least altered the shape.
Bruises can form despite the fact that the outer skin seems protected, but this would take a lot longer than the time it takes for Ponch to get to Grossman. So if the wound is supposed to be an abrasion, the strap would have altered it, and if it's supposed to be a bruise, it appears too quickly. See more