If Nyholm's and Canning's endgame was really to lure in Lockhart/?'s biggest client under the guise of pursuing this dead-bang loser distracting lawsuit and bankrupting the firm--see this bright, shiny object over here? no, this one--then they've breached their fiduciary duty to their original clients, the ones that hired them to defend against the class action suits in the first place.
They were supposed to settle against the $25M judgment, were they not? Instead, they played shenanigans and enriched themselves by poaching another law firm's biggest client.
Seems to me that Lockhart/? should approach the medical equipment/pharma companies that Nyholm and Canning represented and let them in on a few facts of legal malpractice possibly leading to those companies becoming clients of Lockhart/?. Once they pay off the class action, of course.
The original client wanted Nyholm and Canning to take out Lockhart etc. because they were tired of losing to them. So by luring away LG's biggest client, they were doing what their client wanted. The client was willing to write off one more class action loss to prevent more future losses to Lockhart etc.