Ok so the mage/lock one has been around for months now (recently reposted) but this one i kind of found out by mistake a few weeks back and thought i'd post it :P
Basically I was flag carrying in horde base and wandering how the fight to kill enemy flag carrier was going so I targetted some rogue in attack (was 40+ yards away, other end of of the map) and /cast Mind Vision to see what was up.
Now he was looking at some ally paladin, who was on the roof (rogue was in ally flag room) so i cast mind vision again to see the paladin's view, then saw their flag carrier.. so did a mind vision on him to report location and where he was headed etc.
Now, the interesting part, when I cancelled mind vision (was being attacked), I couldnt see me carrying the flag and neither could other hordes with me ;P
I've now done this a few times and can surmise it in a few steps for ya's :
As Priest flag carrying when safe,
1) Cast a mind vision and find some of your own team mates on the other side of the map (40+ yard range)
2) Bounce it (i.e cast, then select a new target and recast Mind Vision, unlimited range ftw) a few times on opposite faction(cant do this on your own faction - only bugs when on enemy players that you cant /target normally)
3) Cancel Mind Vision.
Voila youve hidden the flag!
(Copious amounts of noggen is <3, just remember you need to re-Mind vision bounce to lose the flag)