1. Good question
2. We don't yet know what indications were being shown on the flight deck. The crew MAY have seen engines operating normally or with minor damage. What's the rush?
3. See above
4. See above
5. See above - with addition that fire crew MAY have recommended evacuation rather than indications on the flight deck.
AAIB report will probably give us the answers - there is nowhere near enough information yet.