Buffy hadn't wanted to initiate an attack while the zombies had appeared to be in a seemingly trancelike state, rather than an offensive one. But once the first zombie's head was shot at by Faith, that definitely wasn't the case. They were spurred on by the destruction of their comrade, and it seemed any bit of calmness in the zombies had been severely disrupted.
"Oh well," Buffy muttered to herself. "Time to kick some rotting ass."
And bolt after bolt was released from the crossbow, each one connecting with a zombie in some fashion. Most of them hit dead-center in the middle of their foreheads, while Buffy needed to shoot others in their legs to slow them down when they were simply grouped too heavily together to get clean head shots.
"They just keep coming back!" she yelled to the others, shooting a nearby zombie right between it's eyes. "We have to get inside or this isn't gonna stop!" It was then that she'd noticed the path leading to the open gate, and she began moving in that direction, signaling for everyone to follow.