Kaen takes off his pack, reaching into it and retrieves both a torch and his flint and steel. Lighting the torch, he turns to his teammates. "Open the door and close it behind me, that should keep them from getting to you. Do keep an ear open in case I need assistance, though." He then enters the building, activating his protective field as he waits for the swarm to arrive.

Spoiler: OOC
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Have someone open the door with a move action and someone else ready an action to close it after he steps through.
MA: Get into the building.
SA: Activate the Bangle of Barriers to use its force field effect. Because I have one essence in the veil, it has a 3 hardness and 9 HP