Hella Bad Vibes (Book 21)

Jake, Ax, and Tobias stake out the barn. David breaks bad. 

Did David really kill Tobias, or did David just kill another hawk to mess with Jake's head?? Would the Ellimist even allow David to kill Tobias?! Doesn't everyone suck the ketchup out of those single-serve packets? When is David just a scared kid behaving terribly, and when is he a opportunistic little worm? Who would be the Animorphs' designated "executioner": Rachel because of her capacity for violence, or Ax because of his experience as a soldier? How the hell are the Animorphs going to solve this??