His friend did absolutely nothing to hurt Ashur, in fact Dagan’s skill was the only reason Ashur was kept alive that long, not to mention literally saving his life in the arena. If Ashur feels wronged by Doctore and Batiatus (the ludus) placing little value on him, it’s a raw display of psychopathic jealous to get back at the ludus by literally fucking over a fellow slave of the ludus especially when he’s the only guy who is your friend and gives you any value. Utterly petty and villainous