Examples of "surprise" from B393?

[Ulzgoroth]

In most cases I wouldn't use Psychology as a reactive 'he goes for a knife, let's see if you saw that coming' roll. If Psychology twigs to a threat, it wouldn't be in the moment that it materializes - you'd have recognized the potential danger earlier and would (if you don't like being stabbed) be Focused on that threat, guaranteeing you don't suffer surprise.

Body Language, I could see lighting off reactively.