I guess it depends on what the novel is about. For instance, if it’s a thriller and the protagonist has to catch a killer by the end of the novel, then you may not be able to introduce such a large reveal as survivors guilt in the first two pages. To explain that in the first 500 words unless it happening at the moment may force you to tell it rather than show it. You don’t want to start a novel with two pages of telling. How are you planning to the reveal his guilt?
I’m aiming for the reveal to be in the second scene. I don’t want to show it in the first 500 words of the novel, but in the first 500 words of the second act. As for how I plan on doing it, http://www.writersdigest.com/forum/viewtopic.php?f=35&t=75278 (note that this is titled as ‘scene 1’, but that was when I was thinking of starting the novel with this. I now believe that it should be scene 2. I’m trying to figure out what to put in scene 1 (which I know should introduce the protagonist and, in which, I want to introduce the sidekick and their relationship).