Interjection posts are meant to allow players a chance to respond to what's happened to their character instead of having to respond to everyone else's posts in one giant wall of text.  The posting order however is iron clad unless someone says they can't post for whatever reason, so it's to make it easier on everyone really to allow smaller, much more direct reactions to a villain's actions instead of waiting until there's several other posts to take into account.<br/><br/>That said, I know it can be frustrating, especially if someone forgets they let others post ahead of them or they change their mind and can suddenly get something up when earlier it seemed unlikely.  Or we're waiting on one person for too long to respond so the rest of us can do so.  Kinda like how I'm waiting on Mia so I can finally let Silk's character free to do her thing.  Some people would call that rude.