Barit - because it didn't manifest itself until after top of descent, at which point they thought they'd lost 25% of their useable fuel. In that situation there was not time to speak to the engineers on the satphone, the priority was to get on the deck.
Sven - There was no engine FIRE, and no FIRE warning on the flight deck. It was an engine surge. The subsequent examination showed no evidence of an engine FIRE.