There is a locked door here. If you have a
key you can use that to open the door, see
5. Being right before the link should be enough for the formatter to figure out that the key is required to be allowed to follow the link. Else you can try to open with the
sword, if you have it, see
10. Hopefully the magic is good enough to pair pre-conditions to links, or more markup must be added later. You could also try to go back to pick up the key, see
12.