Horrible photos...sorry about the injury! I'm going on 10 yrs on Fogmans and still believe they are one of the (if not "the") safest systems available. This, despite my son breaking his ankle last summer (one of the friends @chef23 mentioned) on his new Diablos (out the front, stuffed tip, released a split second too late - he was only about 115lbs and I may have had the release tension set a bit to high...). In my own case as I have mentioned previously, great record...two pre-releases (one due to releases moving on adapter plate - my bad,- and one unexplained). not bad in 10 yrs.
I may have misunderstood @bracemaker point about both ankles releasing from the ski, but that is what necessarily happens w/ Fogmans. They either release or they don't...but one can NEVER release w/o the other.
As for the installation and maintenance of the system, yes it must be very accurate (location and spring tension) and one must keep the releases in good operating condition.
Best wishes for the injured skier. (as a Portuguese skier, let me wish the Brazilian gentleman quick recovery in his native language...rápidas melhoras!)