Some people tend to take things a little too literally. We're talking about the type of people where you ask for mayo on the side and they put mayo literally on the side of your sandwich. Or the type of people who do exactly what was asked of them with no thought behind it (putting the sheets on the bed = leaving the sheets in a pile on the bed). Let's hope you're not one of these people!
A Bit Literal
The directions specifically said to show your thinking. If the teacher wanted the student to write out their thoughts, then they should have said that! Obviously, the student took the directions in the literal sense and quite literally showed themselves thinking about Bobby.