He makes it clear that a reaction is not the same as getting Covid, so the deadly effects of Covid will not be part of the reaction. But, a very uncomfortable reaction can be expected to the second shot.
The problem with Dr. Fauci and the talking heads on high is that they refuse to talk straight to America. They want to sell vaccines at Moderna and Pfizer, so the truth is withheld. This caused people to suspect that something evil is being perpetrated. Again, Kings and Presidents are liars, and they have been for thousands of years. So, doctors like this guy pick up the slack and help. What he says makes sense as best I can understand it.
CAUTION: Some rough language.