According to the lawyers website, the action is on a no win/no fee basis, so the lawyers are not guaranteed of coming out of this ahead.
Conversely, the lawyers fees in no win/no fee class action cases of this nature can be up to 40% to 50% of the total damages awarded. No guarantee .... but the attorney could walk away with a princely sum!
Because a traumatic event occurred, I suspect the US attorneys are on a good bet with only the quantum of damages to be decided.