I really don't see the problem. As far as they were concerned it was out
Well the advice we are given in my company is that unless a fire can be positively and absolutely determind to be out then you should land ASAP. So a waste bin fire that has had a BCF and a few bottles of water poured into it and the contents examined could be meet that criteria. A cargo hold fire that went out after a bottle was fired at it certainly does not, as they subsequently found out.