Crusader said:
Does Touma ever train or prepare for potential nightmare scenarios where he's all alone and the antagonists get the idea just to simply shoot him with normal weapons or assassinate him with bombs or poison?
He probably knows some gun disarming techniques due to his streetfghting experience, but knows when to duck for cover to avoid anyone getting a clear shot at him.
Was Touma's streetfighting martial arts completely self-taught BTW?
I would think he just picked up a few things as he ran for his life from the Skill-Outs and various espers (maybe) that attacked him.
Plus the fact that with his "Minds Eye" (which he may or may not realize he has) helps him with minimizing the amount of damage he would take.
For the potential Nightmares, I think he just charges in without a plan and just use his quick thinking on the fly to fight back.