I'm not a lawyer.

I believe it's a question of "who is found liable" and then "what is the damages" and then the damages are split between those who are found liable.

If it was Greenpeace and {Some Org} that were both found liable, then that could be split 90% {Some Org} and 10% Greenpeace.

However, if only Greenpeace was found liable it would be 100% Greenpeace despite how little interaction they had.