Think of it this way.
The business is a LLC and has a $1M umbrella policy (hopefully). That equates to about $50K per person. The law firm will take about $15K per client. If they can get all of the victims, they will make approx $300K.
Thats worth flying across the country and setting up an office for a few months. The sickening part about it (pun intended) is that those that became really ill will have medical expenses far in excess of whatever they'll recieve.