The United States had millions of dollars invested in businesses in Cuba and there were many U.S. citizens in residence there. The U.S. also traded goods with Cuba.
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One of the implied powers that the president has, is to veto a law by using explicitly granted by the Constitution of the United States.
It honestly depends on their personal situation. Some may have gotten away or looked over (extremely rare and lucky), and some may have just survived.
The body is insane and will do anything keep us alive - that's it main job. Some people who go into shock manage to survive, as their body shuts off any unneeded parts - mental awareness, etc. Some people also may have just gotten lucky, and their bodies may have lived through what they went through.