I think that point is actually one we agree on. I would never write someone up for a paper airplane, first of all. Secondly, if a teacher takes care to administer all discipline in PRIVATE, then decisions such as different consequences, letting things go based on personal circumstances can be made much more easily. The biggest issue here was the public punishment (which was public if the girl was able to intercede) and perhaps over-zealousness on a minor offense to begin with. I remain with the opinion that once he did publicly state the consequence for the action that he had to follow through with the same for the girl or risk more drama.