You may receive a citation in the mail because the flashing yellow lights signal to all drivers that the bus is preparing to stop and you should be stopping as well. I think you could ask a judge to consider the circumstances that you didn't want to be stopped halfway past the bus, but technically you have violated the statute.
If you do receive a citation, make sure to enter a plea of not guilty and attempt to resolve the matter to a lesser charge. Passing a school bus in PA is a possible 5 point violation.
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Plus a mandatory sixty day suspension of your driving privileges. Promptly consult with an attorney.
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Both of my colleagues are correct. If you get a citation in the mail, plead NOT GUILTY and ask for a hearing and contact a lawyer who handles this kind of case. Depending on the ticket and violation cited... 3345a is 5 points and 60 day suspension when the red light are flashing. With proper representation, a less charge may be negotiated.