Hi MC,
Thanks for your questions.
Those photos were taken at Point Cartright. Getting out is actually pretty easy. There's a protected beach inside a breakwater, so it's just a case of paddling out and timing your run through a drop zone, - then you literally paddle around the waves, and wait for a set.
Occasionally you might get caught (there's a photo of that in the first set of pictures) and then it can get a little interesting...
In the last photo a good portion of the wave face in obscured by the wave in front. Most estimates from those there on the day, put the face at around 8 metres, so about a 4 metre wave, - maybe a little less.
If you lose your ski at that location, you'll either be picking pieces of it out of the rock wall, or your ski will end up "some distance" away. Either way, you're in for a bit of a swim.
If you do "lose it" in those conditions, - get away from the ski. If you're still on the ski when the wave breaks on you, your weight in the seat will destroy it. The other thing most people that I know do as well, is roll into a ball and cover their heads.
These things fairly rocket into the air with the force of a wave and when they come down, you don't want to be under them!