It was a rough ride for the Big Four banks as well as the markets over the past five days, with Bank of America (NYSE:BAC) in particular down 3.48% for the week at the start of the last day of trading. Promising jobs news from the federal government today looks set to keep Thursday's late rally in motion, but B of A has a lot of ground to try to make up, and the major trial currently underway isn't helping things.

Mixed messages
The Labor Department is reporting that the U.S. economy added 175,000 new jobs in May, beating expectations. The unemployment rate rose from 7.5% to 7.6%, but this is because more people are returning to the workforce. This is the good news.

The bad news is that B of A is in the middle of a trial in which tens of billions of dollars are potentially at stake. On Monday, opening arguments began in a case that pits B of A against, among others, AIG (NYSE:AIG), over bad mortgage-backed securities issued by Countrywide Financial, the subprime lender B of A acquired in 2008.

Arguing for the originally agreed upon settlement amount of $8.5 billion are BlackRock (NYSE:BLK), bond-giant PIMCO, and Bank of New York Mellon (NYSE:BK). Opponents argue that losses attributable to the bad mortgage-backed securities could be as much as $100 billion.

Foolish bottom line
There's obviously a lot at stake in the ongoing trial. The silver lining is, the $8.5 billion was accounted for when the original settlement was announced. So if B of A can successfully reargue its case, B of A shareholders aren't in for an unexpected $8.5 billion hit. The problem is, of course, what might happen if B of A doesn't successfully reargue its case.

Investors are in for another week of holding their collective breath, as the judge has officially set aside these first two weeks of June to hear the case. But in the end, we all know B of A is still too big to fail, and in the past, fines, payouts, and settlements always seem to be carefully calibrated to inflict pain without causing death. Unfortunately, if this case goes against B of A, that pain will fall on shareholders in the way of a depleted bottom line and a depleted share price.

Glances at the ticker over the last hour of trading show that B of A is swinging between red and green, while the three market indices and the rest of the Big Four banks are solidly in the green. As such, it appears that B of A's legal woes might be keeping its stock from the strong bounce-back everyone else is getting from the good jobs news.

What goes up must come down, but in the case of B of A, the stock will very likely go back up. 

Fool contributor John Grgurich owns no shares in any of the above-mentioned companies. Follow John's dispatches from the not-so-muddy trenches of big-banking and high-finance on Twitter @TMFGrgurich.

The Motley Fool recommends American International Group and BlackRock. The Motley Fool owns shares of American International Group and Bank of America and has the following options: Long Jan 2014 $25 Calls on American International Group. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a scintillating disclosure policy.