On the afternoon of May 3, Roger Fortson opened the door of his Florida apartment with a gun in his hand and was immediately shot six times by a sheriff’s deputy responding to a complaint about an argument.

Fortson’s supporters point to the deputy’s rapid decision to open fire and his mere presence at the apartment — where the Air Force senior airman was apparently alone and FaceTiming with his girlfriend — as proof that it was a blatantly unjustified killing and the latest tragedy involving a Black American being shot at home by law enforcement. Authorities, meanwhile, have seized on Fortson holding a gun when he answered the door to cast the shooting as a clear-cut case of self-defense for a deputy confronted with a split-second, life-or-death decision.

Investigators will consider these factors when deciding whether to charge the deputy in a case that also reflects the realities officers face every day in a country where millions of people carry guns, including in Florida, one of the largest gun ownership states.