Please touch the least possible. The door, cables and springs are in tension that may release quickly.
Modern garage doors are smooth and efficient. However, they are a very balanced movement to operate. Meaning that a slight impact or disruption to that balance it goes very awkwardly. Often time it reacts quickly and strong. The tension of the torsion springs and connection to the drum cables becomes unpredictable. Please touch the least possible. The door, cables and springs are in tension that may release quickly. Whenever possible leave a lone and contact a professional to address the situation. Sometimes in our efforts to make it better we make it worse and can create more damage.
Once the tension is released from the configuration the repairs can begin. Once all assembled the damaged components are replaced accordingly. The configuration is re-assembled and then the adding the tension process starts. Once completed a couple tests are performed to ensure function and calibration. Back to use as normal.