Four days in court
Partly brinkmanship, which they lost.
And partly because all those legal arguments prepared intensively over a period of months or years take on a whole new or different perspective when aired in open court. The same way all the excuses you had prepared to convince your wife that nothing happened fall flat when she is standing over you with the bread knife.
So U’s lawyers would have said “This is looking a little iffy” and “Better to do a deal before the judge sinks you.”