In the season one crossover episode "Sanctuary" after Buffy finishes confronting Faith on the rooftop, watch Buffy's eyes after Faith says "Just tell me how to make it better." Right after Faith says that, a member of the Watcher's Council bursts through the door, and begins firing. But watch Sarah Michelle's eyes right before this happens. She glances towards the door before Buffy could even know that somebody was going to come out. Watch carefully, it's hard to catch, but it's there.