Lab 7.04: need clarification on attack effectiveness

[smeredith]

For Water Type:

When attacking a grass type the effect is less effective

I don't understand how this is supposed to work, so I think the students will have trouble with this as well. The attack() method doesn't take an enemy. But defend() does. Does that mean that Grass Type's defend() should look at the type of enemy and take less damage if it is a Water Type? If that's the intent, I think we need to spell it out a bit in the lab instructions.