The 'Jotunn' - that was the nickname of the Valkyries' Third Heavy Air Wing. Major Growler must have put Treechopper in charge of winning the Grand Tournament, and she was clearly dedicated to the task. Artemis supposed that kind of dedication was how she got promoted to be Major Growler's right-hoof mare. Still, this was starting to sound a bit like she would actually sabotage the Whirlwind.