What I think is going to happen is, Lizzy (unconscious) wakes up from the explosion with only bruises and scratches. She hears not to far in the distance Bricks in pain (injured or stuck in wreckage) with tardust (has only bruises and scratches) standing near him trying to help. Instead of using this chance to flee, she goes to see if she can help him.

The three of them hear a loud roar. Tardust then just stands up and says "There going to be here soon, sorry buddy, it was nice knowing you but - survival of the fittest or gotta look out for the top dog", "Hey girl you coming or what!". Lizzy stays with Bricks trying to help him and see's Tardust fleeing as he disappears into the smoke. Use your imagination after that.