Whats the difference between an alarm and a warning?
http://http://www.oxforddictionaries.../alarm?q=alarm
As for the 8-10 min time frame that we are getting a hard on about, we hope that the pilot likely knew that difference. and as the AAIB report 0.4kg in one and zero in the other supply tank is it not as likely he flew for the appropriate amount of time with this red "low fuel" warning?
Given EC135's in general are still flying I think that maybe the case.