We don't know if an alarm company got the fire signal, but my guess would be that since they had an alarm system it probably did report to an alarm company.Another thought - my alarm company has on file an "in case of emergency" alternate number. We were required to give someone's info who does not reside at our house. Perhaps SS had given his parents number and the alarm company alerted them, and as prior owners of AIW they knew who to call to find their family and that was how the word got out to AIW so quickly?
ETA: never mind. I don't think we know whether an alarm company got a fire signal. Don't mind me....
It does seem possible for the alternate contact number to be called, that person called AIW, and the person at AIW knew that SS was suppose to be at dojo at that time. They would call there looking for him since he is not answering his cell phone. I think it is very possible for all of that to of happened in 16 minutes.