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This lacks malicious intentHow does this lack malicious intent? They deliberately pointed a gun at a person, put their finger on the trigger, and pulled. The intent was to kill, and killing is a malicious action.
The action was not otherwise justified because the victim holding a firearm was not illegal. Even if the victim had been pointing the gun at someone else, it would be unknown whether the victim was themselves only acting in self defense.
> In order for manslaughter to be permissible, there has to be an imminent threat or death or great bodily harm that a reasonable person with the knowledge at the time of the manslaughter would believe to be probable
This is obviously not the whole story. By your framing, someone who breaks into a house would be legally justified killing an occupant who appears to be defending themselves. For the original scenario, a reasonable person would not insert themselves into a situation and then shoot the first person they saw with a weapon.
The Rittenhouse verdict was a sham motivated by politics, and doesn't change the shape of what ought to be. And what ought to be is that if you create/escalate a situation by adding yourself with a firearm, you had better be absolutely sure that your use of it is justified. And that goes regardless of whether or not you're being paid to insert yourself into situations.