GZ was not supposed to be packing OR approaching possible subjects, according to the guidelines, for watch-persons, of his type, per their national organization. But GZ was a self-appointed watch-captain, which may have played a part, in the decision to fire former SPD Chief Bill Lee.
"We don't need you to do that," said Dee Dee the dispatcher, but GZ got out of his car, followed Martin, failed to identify himself, TWICE, failed to defuse the situation, shot Martin, DEAD, without wounding or warning Martin, with the fatal instrument, and then GZ LIED, to SPD and anybody else he talked to, in any several interviews.
GZ LIED, since he has to explain, why Martin had no wounds on his hands and why Martin's body was found face down, partly on the sidewalk, partly on the grass, and NO GUNSHOT RESIDUE WAS FOUND, on GZ's red jacket.
This is problematic, since GZ variously claims he was attacked, sometimes by a blow, sometimes by a lot of blows, sometimes with head-smashing, which the SPD lead detective didn't believe, since GZ's wounds look fabricated and superficial.
According to inference, from GZ's stories, he should have shot Martin, while Martin was on top of him, but this couldn't have happened, with the gun at an odd angle, and GZ being under Martin, WITHOUT A WHOLE LOT OF GSR GETTING ON GZ's RED JACKET.
So GZ lies, and lies, and LIES, trying to figure out a way, he should have not waited, for the SPD, to come interview Martin, whom GZ approached and shot dead, as a clear violation, of Martin's civil rights, by holding his gun, at arm's length, to shoot Martin, right up against his chest, while holding his flashlight-keychain, which was found right by Martin's body.
This is a sound murder-2 case, complicated by general negligence and a cover-up, by SPD and by former Chief Lee.