1) If possible, rescue the animal.
For this you should only touch the animal with a cloth and carefully place it with the cloth in a box (with very small air holes). Close the box very well.
2) IMPORTANT please, contact immediately a bat expert for help!
Even if the animal is supposedly fit and unhurt, please contact a bat expert immediately.
In order to be able to assess injuries and weaknesses, it requires veterinary experience. Even with severe injuries, the animals may appear to be fit, but they desperately need lifesaving medical help.