Buffy: The Vampire Slayer - If You Run Fast Enough...
Yes, the episode which had its US broadcast delayed, because it features a student bringing a gun into high school.
It starts when Buffy realizes the 'shooter' is in the clock tower. Remember the time. She runs - she jumps - she almost flies - and gets up to the roof. The time is now forty minutes earlier.
Copy of Earshot
on 11-12-2000 and