You might be able to fight reckless endangerment charges by claiming self-defense, but it can be difficult to prove without a lawyer’s help. Your attorney may argue that you were merely responding to someone else’s reckless conduct or that you were defending yourself in a situation involving a violent crime.
Another route is demanding a bill of particulars, which involves compelling the prosecutor to list specific details which are difficult to prove about the alleged crime. This can sometimes lead to your charges being dropped, which is a huge relief.