Since tricking and goading were not successful, Jack decided to just attack. The worse was simply dying and losing one level, he still had the Immortal Soul he could count on. He cast Mana Bullet and jumped to the side, just as a knife flew past where he had been. Oswald had also made his move the second Jack attacked.
Several knives fleeted over, Jack never stopped moving sideways alongside the edge of the gorge as he parried and slashed at the incoming knives as he shot ranged attacks at Oswald.
The two continued to compete in range attacks, with Jack at an obvious disadvantage. Still, Jack was glad the assassin didn't execute the move he had used when he decimated the Mouseant swarms or when he killed Jack's stallion. Probably those skills had a long cooldown, he would have been one shot if Oswald used them.