As usual, straight to an illogical conclusion.<quoted text>you're on the wrong page.
An inmate escapes prison and is hitchhiking, a state trooper pulls up to investigate the hitchhiker and while this is occurring a motorist who has a beef with the trooper rolls up and opens on the trooper with a firearm and the trooper goes down. the motorist then realizes his witness and gets out of the vehicle to get a better shot at the hitchhiker. The hitchhiker then snags the trooper's pistol and shoots their assailant dead with the trooper's piece saving both their lives.
In this scenario, the state is not going to charge the escaped convict with stealing the troopers firearm, nor is the state going to charge the inmate with possessing the troopers firearm, nor is the state going to charge the inmate with shooting the assailant. The only way a felon in possession of a firearm charge is going to occur is in the case where the felon then leaves the scene of this shooting with the firearm in possession with the intent of further fugitive endeavors.
It is indeed a felony to use a firearm during the commission of a crime. The act of escape is the commission of a crime. Even in your scenario, the escaped prisoner may be charged.