That's right, it sure will. Well, first of all, there are certain stages or periods of grief that people will go through. Now these stages of grief do not follow a schedule, but for the most part they can be somewhat predicted. The length one person is in a certain stage can be different from another person's time in that same stage. I really believe that God gives us the feeling of shock to initially protect us.
Shock helps buffer the reality of the loss.
The person may appear distant or dazed or rational and calm. In a few hours or days the shock goes away and the fact of the loss hits home. They weren't willing to accept the loss. I remember when I was a senior in high school, late one night a classmate of mine accidentally shot himself. The next morning I saw my English teacher before school.