[quote=@Crimson Flame]
I was going to have Danny discover his powers the next morning. He wakes up and finds he can see perfectly without his glasses, and he also suddenly has muscle definition and is flexing in front of a mirror (Just like the first Spider-Man movie.)

Of course, if something happens in the next post that warrants his powers showing up sooner, that works too.
[/quote]

Nah, you should be fine going with your original plan. There won't be any baddies for them to fight that soon. Luke and Donny will notice their powers a little, but they won't be in a combat situation until a day or two after the event. I'm thinking maybe 85% of the crowd dies that night at the park or later at the hospital, while the other 15% stabilize. So if we say about 1,000 people inhaled the mist, that's 850 deaths and 150 new mutants. Of those 150, many will show only minor changes or they will remain dormant for a while. Only a few dozen -- including our characters -- will actually become superheroes or supervillains. Even some who have significant powers will likely still hide once SHIELD starts poking around.