Little_Rad_Hat
The card is the clue
Picasa Web Albums - joyceastifanfotos - WST #10 - Goo...
Not correct.
I cannot recall any card which shows two different evacuation paths in case of ground landing or water landing. Just checked Ryanair one and does not give any clue about which doors use in case of water landing. Check the link.
Maybe some cards have this information. I cannot recall any safety briefing that in case of water lading the rear doors shall not be used to evac the plane.