Unpopular opinion:
Several people on here have said, and I haven't unilaterally disagreed with, variations on the theme of "If I get pepper-sprayed and/or maced I assume they are trying to take my gun and use it" or "If that cop get's hit with his own mace he's justified in shooting because the criminal could take his gun".
If (IF mind you, I've not seen definitive video) dead guy deployed bear spray on the shooter and his group first, a reasonable case could be made that dead guy started an incapacitation attack and the shooter was afeared for his personal safety. That's the tack I would take if I was his lawyer, anyway.