Talk:Hextech Sweeper/@comment-605220-20131221055847/@comment-25375258-20140909000509

I think that they mean is that during that 5 second period, any enemy who appears in the mist will be revealed for 3 seconds.

In other words, if a champion enters the mist at the 4-second mark, they will then be revealed for 3 seconds (including 2 seconds after the mist dissipates)