From a video of some of the best tourney buzzer beaters: :20, No one guarding, but over 5 seconds, so there was plenty of time to get it up court regardless. 2:20 No one guarding, not sure how much time, think just about 5 seconds, but no one even tried to challenge him. 3:30 , Guarded 1 second left, Pretty well defended, but he was still between his man and the basket and not his man and the ball. 3:50, Unguarded, the famous Endy coast to coast, 4.8 seconds when he started. 5:00, Guarded, the Valpo Drew shot, well defended, but just a great play. 5:25, Not guard, not fronted, just bad defense. Laettner Duke winner. That's 10 Guarded, 5 unguarded and 1 guard and steal. So after watching all of those, I say guard the inbounder, front anyone near the basket and try to cut off anyone in the backcourt so they can't catch the ball while already heading towards the basket.