Most Body Worn Cameras (BWC) have a 30 sec. buffer meaning you hit button to activate it starts recording from the 30 secs prior to activation as soon as they are taken out of dock they go into a standby mode.
To fire across your partner means something really made the Officer think he or his partner were in danger it will be interesting to hear the official statement as to what it was exactly that startled the officers causing the reaction.
Yes and either way murder is illegal if you shoot someone it is a deliberate action caused by you a human towards another human regardless the reason if they die it's a homicide it's up to the DA to decided after reviewing the case circumstances and evidence whether or not to pursue charges of murder or lesser degrees such as manslaughter or to rule it as a justified homicide.
I've worked three homicides this month it's dirty and not fun.