Ant Hikers

So, Hagrid made a teeny tiny cairn. This is evidence of his innately rebellious spirit, since there was a plethora of signs stating that a hiker building a cairn was not only destroying the environment, but also the pleasure that a person might get while hiking. In fact, it could cause an innocent hiker to lose his way. Imagine hiking all over Mt. Desert Island following the igni fatuus of bad cairns!!!!!!!!!!!!!!!!!!!!!!!!! Anyway, despite it being a rebellious action, it would not really have many negative repercussions since it was so small as to be only visible to ants or people crawling with their noses touched to the ground.

SO.

Hagrid and Karl were discussing in a humorous way the aforementioned ant cairns that throw off ant hikers, to which Lupin answered:

"Wait! They have ant hikers here?!?!?!"