I'd say that this lawfirm has no basis to go after Ryanair. They should go after the pax that refuse to pay the 95 quid commission.
However all of this is not by chance. I'm pretty sure Ryanair is paying out to pax directly because they know this will cause issues for the law firms. I'm guessing Ryanair's game plan here is to have these law firms no longer accept Ryanair cases? Or force them into asking the pax to pay the commission up-front..which will cause many pax (at least the ones who are not sure totally about their case) to not start the procedure at all.
I'd say smart move on Ryanair's part. Not great for the consumers, but definitely a smart idea..