>>149458006It happens in the season 4 finale
everyone guilt trips him about how they are all exhausted by constantly sacrificing their way home and having to live with their lives in constant danger just to help dinosaurs, so he volunteers to do a solo mission to break in to an office that has a satellite phone and a dinosaur control console
Darius briefly stops some dinosaurs from fighting to the death but then he spots the phone and barely hesitates to leave them if it means he can get the phone and get his friends home
But without him on the console the dinosaurs start fighting again, and the other kids are outside watching the fight in horror wondering why Darius isn't stopping the bloodbath/spoiler]