Hajime is perfectly willing to go horrible giant bug on any of the statues in order to give everyone a chance to escape. He's got super strength and heals pretty fast, and he'll attempt to punch them into submission until someone's got to haul a punch-drunk roachman out of there.

Arthur hasn't yet Echoed back anything that will help, and so he's going to be focused on helping the others get out of there. He's big and pretty strong for a normal human, and he will carry people away if he has to. (He does not think summoning all the silverfish in the area will do something, and clearly Elian should've had some beachfront property so he could do more to help at this point.)