Yes that's possible. Maybe Martin was going to beat him to death. However, listening to the tapes of Zimmerman crying for help when he was confronted also throws up the possibility that, if he wasn't carrying a gun in the first place he wouldn't have shown such bravado/confidence/arrogance in tracking Martin.
Therefore, the gun still causes a huge problem in this story. This whole tragic event only took place because a man had a gun. I assume Zimmerman felt great remorse for being forced to shoot someone dead.
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