Out of Character: Even if it was a decoy its a real fire with a person trapped inside. There aren't any police around so we probably know more than them.
Out of Character: My character doesn't have enough time to check the scanner, there is a person in danger inside the building. Play By Post, are you sticking with the same action you put back in 20 hours ago?
Out of Character: Yes, same action there isn't a reason to change it that's what Assassin would have done especially since he does not need clean air to breathe.
Specific Action: Assassin stays with the victim and explains to the police what they saw and did including the muggers that escaped.
In Character: Assassin tries to talk to the man, "Are you alright? Can you hear me?"