how?
BAD told me all about it. Basically, he was walking around downtown late at night, when out of nowhere, a land-dwelling shark zombie jumped him. Normally, shark zombies really are not threat to the awesomeness that is BAD, but this one had been hunting him for quite a while, so it knew his weakness. Knowing that BAD is Asian, and thus, an expert in karate, he knew BAD would try to kick him, so the shark zombie grabbed BAD's foot, and twisted it.
I know, I know, things aren't looking great for BAD at this point. How would he ever defeat the shark zombie? Well, you'll have to ask BAD for the rest of that story.