We could make it an IC mistake though. Ethan says "dirty bomb" and everyone thinks it's radiological - especially Mika. And then it turns out it's biological.

That said, if it's got any kind of electronic fuze or control device, she could still disarm it pretty handily. She'll try to get to the bomb and do so. I'll wait on a definitive GM call on whether that will work before I write up my next post.