Richard Alpert and the others capture Kate and Sayid

Richard Alpert walks out of the jungle to find Sayid and Kate pointing guns at him. In an old school, season 2 style move, the others surround the duo and hold them a gunpoint. Kate and Sayid are then marched through the jungle. By my count, there are at least 16 others including Richard, possibly more.

Why did the others capture them and where are they taking them?