The reason you cannot vote to reopen is because it was a migrated question. If a migrated question is closed at the new site, then it is considered a rejected migration. This is explained in this Meta FAQ post:
A question can also be rejected by the target community after it has already been migrated if it gets closed (except as a duplicate) or deleted on the target site. When a question which was already migrated gets rejected later, the entire process of the migration is reversed, except the original question will remain closed as off-topic. All the answers are returned to the origin site and undeleted* and are subsequently deleted on the target site. Also, the rejected question on the target site will be locked, then automatically deleted 30 days later.
As for why this particular question was closed, there are a couple reasons. First is that the original version of the question was asking for a legal definition, which is explicitly off-topic here. It likely received one or two close votes for that reason. Second is that the question was poorly written, so it isn't clear to everyone what exactly the OP wants to achieve. Yes, the difficult colleague is obvious, but the desired outcome is not, particularly when reading the original version.
The normal procedure for a poorly written question is to close it, edit it into shape, and then vote to reopen once it has been fixed. Unfortunately since this is a migrated question, there is no option to edit and reopen. If it had been posted on our site originally, it may have been saved.