The insect in that picture isn't a dragonfly larva, it's a small dragonfly or possibly a damselfly- can't tell without seeing the wings. See the fuzz on its front and the narrow abdomen? Either its wings haven't expanded yet (the larva sheds its exoskeleton and the adult crawls out with its wings all rumpled, the veins have to be pumped full of fluid) or its wings were damaged and can't unfurl. It won't last long if the latter is the case, usually something gets busted internally if they're roughly treated while that soft and delicate.