I do trust Zea when he stated his case against Maria. Because of course telling the truth puts him in a better position to lie. Shados' forging aside, it makes too much sense.
I don't really see how one could prove which of Maria and Reg set the bomb though, so just gonna go for Maria.
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MMBN style fighting game made by me in the link below!
http://sandbox.yoyogames.com/games/184947-b8bn