Too Late

At this point, let alone Gilpin, the others were stunned by Dyon's words as well. 

Since things had reached this stage, they had, of course, been trembling in fear no different from Gilpin. But, upon hearing Dyon's blatant disregard, they couldn't help but cast gazes of pity toward the latter. 

They could all be considered peers of Gilpin. Not to mention how often he mentioned the humiliation he suffered at Dyon's hands while he was convincing their Hegemons to partake in this assault, even before things reached this point, they were all aware of the deep seeded hatred he held for Dyon. They had all lost count of the number of times Gilpin had brought it up. 

Though they didn't know what the full story was, they had made a guess that it had to be something horrible. And, since they didn't have favorable impressions of the Nameless Immortal God anyway, they obviously didn't hesitate to believe Gilpin.