Facing Clarke's menacing approach, Marvin had no choice but to come forward.
He knew he couldn't fall back. Lorie was behind him, and so were many innocent inhabitants of Hope City.
Even if this place wasn't his territory, Rocky Mountain had many things that made him recall some pretty good existences.
He was willing to fight to protect this piece of land!
Moreover, back when he stole [Weeping Sky], he had already included Black Dragon Clarke in his kill list!
The current Marvin needed a huge amount of battle experience to level up, and killing a Dragon was no doubt one of the quickest ways to get that experience.
An ordinary Adult Red Dragon gave Marvin 16000 exp, so Clarke would definitely give more!
Thus, he had made a deal with Jessica to let him get the killing blow on the Black Dragon.
It was just that Marvin had overestimated the current Jessica. The Fate Sorceress was trapped and Hope City was on the brink of a crisis.