*walks into burning building* BSI/SCENE SAFETY! *spirit hands* Wooh!
In our class, we went over BSI/SS a lot, and during our practice sims', the proctor gave us a description of the scene, and we had to decide if we wanted to proceed. For example, one was:
You have been called to a private residence for ALOC, as you enter you smell alcohol and suspect ETOH. You also see stuffed ducks trophies hanging on the wall. There is a middle aged man sitting in a recliner in the corner, and is covered up with a very large blanket. The man is alert and tracking, and the house is warm.
Now obviously, we're going to say, not safe, the trophies exhibit that there is a strong possibility of firearms in the house, and if the man is ETOH his decision will be screwed. Also, why would he be covered up in a large blanket if the house is warm. Probably not safe. But I'm still not sure how that would be handled in an actual call. But it describes the critical thinking you're talking about.