- Racial memory of Kaine inherited from Venom (second-hand, from Peter’s perspective of course, but present)
- Parental pressure to be a hero
- Flashback to somebody else (in the previous case, M’lanz) being in danger of dying in a fight with a bad guy when Sleeper went to save the Venom symbiote from Tel-Kar
And I don’t remember if we nailed down whether or not Sleeper is invisible to Kaine’s Spider-sense as with Peter, but if he is, then that too.