yeah, no, so they get across the bridge after the sentinel gets himself thrown off the bridge by vascillating, then they come to this ... i think it's a cave, and inside the cave is supposed to be the holy grail.

then they spot the guardian of the grail, and the holy hand grenade scene, where the priest guy explains how to count properly after pulling the pin and before throwing it, and iirc they throw it, as the rabbit has spotted them and is moving towards them, and the thing doesn't work, so they run away. again. i think there is at least two scenes in the movie where they are all shouting run away and running away. possibly the scene with the castle with the guy with the very bad french acccent.