The post in question is also a locked post. It is pinned as it is a "must read" for those who would ask the question, but likewise it is a statement of fact, not open to discussion.
It is common practice here to lock threads when they are either without need of response, should not merit response, or have simply had every reasonable response possible. The "pin" icon simply preempts the "locked" icon in this particular thread.
"The devil I'll bring you," answered Hagen. "I have enough to carry with my shield and breastplate; my helm is bright, the sword is in my hand, therefore I bring you naught."