Did the crew deliberately use the double width stroller as a weapon to hit the mother? Was the mother trying to put the stroller in an overhead bin, it wouldn't fit, the crew tried to remove it whilst the mother tried to push it back, the crew took his hands away and the stroller fell and hit the mother? (both scenarios alluded to by one of the newspaper reports), so much still to be discovered. The only fact we know is that a double width stroller has no place in the cabin and should never have got that far.