Some people do the most unexpected things. They do what you think is impossible or what you think is stupid. Someone who is unexperienced in budo have their own theories of what works and not. They are not molded into a system that taught them how to do things, so they do what they think will work. Or it could be a martial artist from another style using techniques you never seen before.
Soke said the other day that we should develop this 非常識 HIJOUSHIKI, which means lack of common sense. We should learn to see these unexpected things coming and respond naturally and not be surprised. He did not say anything (as far as i understood) about “banpen fuugyou” ten thousand changes without beeing surpriced. But this came to my mind immediately, it is the same thing.