I don't think he had a particular plan.
I think he showed up prepared for several contingencies. That explains why he had a car full of explosives as well as a backpack full of body armor and hundreds of rounds, but then he ended up just taking a few shots on Trump.
Its not like he has done asssassination attempts before.
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No, but the set of explanations changes if he wasn't solely planning on shooting from that roof.
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That is true. I heard there were two shooters? Have they verified that yet?
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Not that I've seen.
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