As useful as it probably would be to have him aid in their magical research—or more precisely, Crimson’s—the likelihood of the dragon discovering his fatal weakness increased exponentially the longer he remained in his vicinity. He had gotten a decent judge of the dragon’s character, however, and while Handy was relatively certain the younger man was unlikely to leverage that weakness against him, there was precisely zero reason to believe he wouldn’t inform the princesses. By extension, literally all of Equestria and beyond would know his kryptonite.