Girtbar - why would you even consider closing the door again if flames and smoke were coming in? You redirect the pax away from the danger. You certainately don't waste time closing the door again. If you try and close the door, you will more than likely be pushed out by the rush, and you would be useless to anyone. A pax would have no problem opening the door as there is a hell of a big red arrow pointing in the direction to open.
You will always be there to open the overwing doors which are more important to have a crew member there as they are more confusing to open for a pax. many airlines do not brief the pax on the emergency overwing doors.