In episode 6, Optimus tells Ratchet to join him to see about the Decepticons moving energon. So they knew there were Decepticons there. Instead Ratchet says he'll stay behind and help the kids with their projects, even after he just made a fuss about them doing projects there at all. In the first 5 episodes he didn't flinch at the idea of going with Optimus to scout. In the episode where Megatron takes over Bee's body, Bee whoops Ratchet, who is only a scout and not a warrior as mentioned in a previous episode. So is Ratchet scared to fight or just not suited for it? He's my favorite Autobot in this series, even if he doesn't fight :/. I want to see him fight eventually though besides what he did in the first 5 episodes.