(228) When the DJD arrives to recruit Deathsaurus, it all goes terribly pear shaped, diverges sharply from canon, and sees Tarn fetching up as a captive of his new terrible dragon overlord.
Dez has a hunch that he doesn't really have to kill Tarn if he can turn him — and not only is he very valuable for his outlier ability, and the obvious key to bringing his whole deadly team under Deathsaurus's authority, he's also looking very emotionally unstable right now.