It is advised to simply never approach a blue. Professor Kaori instructs his cadets to not approach any blue dragons they might see during Threshing and to run if they do. They were very picky with their riders, so when you managed to bond one like you obviously did, it was a privilege. You never would've imagined, but here you were. Chosen by Ursa, a Blue Swordtail. You landed on the flight field, where the other freshly bonded riders were already waiting. There was only one boy who bonded a blue besides you.