First, there is no obvious evidence of a racial motivation. This looks like a typical example of bad reasoning that I've written about before as seen below.
#JusticeForAhmaud
Video:
Third, you can't tell what the black fellow was doing after he went around the truck and approached the shooter directly prior to the first shot. It is not unreasonable...
Assuming this was murder, it is notable that this kind of public outrage relatively rarely follows a black-on-white murder even though they are more common.