Isn't a guide of sorts. More of a tip.
This is mainly for Rated Battlegrounds.
This requires abit of co-ordination and about 3-4 priests.
The tactic is - Get whoever you want to go get the flag in lets say WSG. Tell him to come back down the tunnel. Before hand have you're 3-4 priests spread in the middle of the field enough so they can chain Life Grip the Flag carrier.
You'll have you're Flag Carrier back to you're tunnel in no time.
Enjoy.