For those who still don't understand....a fall in a house where a child bangs their head results in a subdural haematoma. This can be fatal but death is never immediate and occurs hours or some times days later. Therefore the idea that Maddie fell and died whilst the mccanns were at the tapas is impossible
Personally, I don't see why. Why is it impossible for Madeleine to bang her head at 8:30 when the parents left and not die before 10pm? Improbable, yes. Impossible, no.
The banged head theory could involve a bang at a previous time. Any time after Madeleine reached 5A but before the parents went out, and there is plenty of time.
If the bang happened earlier, and was either not seen or not recorded, there is also plenty of time. Madeleine was pale, washed out, tired at high tea.
To rule out a head bang you need to be able to prove that no such head bang occurred, a task that is impossible. Just as, in absence of evidence stronger than 'Madeleine was tired', you cannot conclude it was a head bang.