Jonas didn't want Gabriel to release because he loved Gabriel so much that he wanted to leave the community
Rescue from Without
When Jonas was traveling with Gabriel outside of the community they both were starving
The Crossing or Return Threshold
What makes Jonas a hero is that he wanted to save Gabriel from getting released, so he decided to leave the community. Jonas helped Gabriel because he loves him. Jonas had to get pass hard times to save Gabriel. Gabriel can also feel love like Jonas can.
While they were traveling everywhere they were able to see things that was never seen in communities
Jonas and Gabriel are sleeping in a very cold weather
Jonas and Gabriel is exploring everywhere with Gaabriel