When we were talking about it before, I was thinking that the Avengers would be starting to patrol the ship and take down bad guys. The open log could be a thread for each Avenger (and whoever else is doing a patrol). Since the superheroes are anything but subtle (guy in shiny armor and cape, guy in red and gold armor, giant green rage monster) they're going to be plenty visible. It should be easy enough for anyone to tag in as a witness, a victim, someone diving in to help them (or hinder them), whatever works for the player. Once the patrol incident is over they can volunteer or be asked to help the group. Does that make sense?