HI. Old Florida boy here. You need to tell your brother to be prepared not to have a roof, and for everything he owns to be wet. If it doesn't happen great. However, I've seen this before, and the only houses that still had roofs were Spanish tile roofs.
Easy to explain. There are a lot of factors that can effect the accuracy of a shot, and almost all of then are amplified as distances are increased. These include everything from the internal balance of the bullet to whether the wind speed changes while the bullet is in flight. Most of the analysis I've seen showed the shot being on target save for Trump moving his head. If that shot came from the water tower, then the timing could be correct.
Trying to find your allies, and documenting everything about you to use against you at a later date.
For anyone interested in researching this technology, it goes by the name of "Social Network Anaylsis" (SNA on /r/sna - thought it doesn't seem to be active anymore), and it's really interesting stuff. One of the other things it can do is identify thought leaders. If you combine this stuff with another area of AI called "Sentiment Analysis" (/r/SentimentAnalysis/ - looks like it was taken over by Indians), you can do some pretty interesting stuff to predict who is going to lead a rebellion, or who is part of a "terror cell". Take the info that these tools pump out, and ask an LLM to summarize it, and you have completely hands-off report generation of potential dissidents.
OMG you can't make this up. https://www.cdc.gov/shigella/index.html This was the first link when I searched for Shigella. Disgusting.
Just to add to this, those hurricane hunter guys have balls of steel. There was a documentary about them a few years ago, and my god do they fly through some shit.
edit: man, Im getting old : https://www.imdb.com/title/tt2187781/plotsummary/?ref_=tt_ov_pl