I'm sorta 50/50 some doors make alot of noise opening or closing.
I think that a person who opens certain doors need to pass a sneak check for you to not notice if a door is opened. If they're running or out of sneak its safe to assume they're rushing and slammed the door so you know they opened it. You just don't happen to see them.
By this logic you should see where explosions are, and hear where bullets are firing from.