Superb question, but one might ask how one hails a jet in that situation? Can the French pilot assume that the Libyan pilot speaks French? Probably not. Should he not be hailed in Arabic? Oh, wait, don't we have Arab League fighters up there sustaining the NFZ? Would that not be handy to have someone hail ... assuming the dialects for different nations among Arabic speakers didn't muddle the hail ...
On the other hand
He went up to fly, and then very soon went back down to ground, so at the time of the attack, he was not violating the "no fly zone" though one can argue "hot pursuit" and such ...
A message well sent by our Froggy Friends: you fly, you die.