The confident walk toward the serrated serpent made everyone wonder if Ralph was crazy. However, when the Molten boar left the taming space and charged right at it, they all worried that it was just plain idiocy driving Ralph and his beast. None of them realized the situation that was happening until it was too late.
The serrated serpent had seen the molten boar charging and just watched it. Even its tanner with the two shields lowered them and wondered how he was going to have to handle such a fool. His beast was too tough to lose to a simple charge like that. It was why he stuck with shields. He just had to defend himself while his beast was trusted to battle.
When the molden boar hit the serrated serpent, there was a moment of laughter since it had actually charged in to the metallic body that the serpent had grown over time. That was until the serrated serpent reared up and flailed to get away from the molten boar.
Basically, the molten boar just saw a large meal for him instead of an opponent