What happens if you pass a school bus right as the stop sign is deploying or if you're just passed the front of the bus?

This really grates my soul.

Basically, I was driving home from the store today when I saw a school bus approaching me. I saw the flashing yellow lights and began to slow down.

I'm going slowly, the bus is going slowly. I'm at a slow crawl, the bus stops completely with it's yellow lights continuing to flash.

I start to pass the bus, and right as I'm like 70% of the way passed the front of the bus, the stop sign flips on and extends.

I know that I'm supposed to stop and not pass a fully stopped bus, but what am I supposed to do in a situation like this? It's not like I was ignoring the stopped bus.

What happens if you pass a school bus right as the stop sign is deploying or if you're just passed the front of the bus?
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