In war memoirs, there is sometimes talk about a feeling of invulnerability among soldiers new to combat: it never occurs to many people that they themselves might be killed. But then something punctures the feeling: it might be that a friend dies, or it might be the sheer quantity or awfulness of death, but at that point the recruit "sees the elephant" and gains a sense of their own mortality. Well, if someone "sees the elephant", how would philosophers characterise the change in epistemological status? For instance, would it be fair to say that the person has gained new knowledge, ie now knows that they're mortal, whereas they didn't know this before? Or is just a case of probability weightings of possible outcomes having changed in the light of new data?