My best guess is that this was not intended, but it seemed to the crew as the best solution to bring the a/c down without any damage to the surroundings and as minimal risk to other people as possible, as Tallinn Airport is situated almost in the middle of the city, that means a lot of habitats and lot of buildings and houses around the airport. This is not any kind of procedure of course, as normally they would of landed on the RWY (obviously), but i guess with their problems with engine and undercarriage they just didn't manage to get in line with the runway at the right point, so they decided not to try to land with 1/3 of RWY remaining (and I should point out there's a busy road at the end of the runway, that connects City to the suburbs), and instead tried to land on the lake, that they knew is covered with ice, and it has been pretty darn cold around here as well lately.