Not sure if this has been posted before but anyway.
This is a trick to be eligible to pickup badges and loot from the one boss, on 2 diff chars (same account).
First make sure both your characters are in the raid, and at the boss, i'll call them A and B.
So your logged on A atm. 5-10 seconds b4 the boss pull, start logging char A out. It takes 20 seconds to log, so the boss will be engaged with 10 seconds to logout.
Once char A is logged out, log char B in and continue the fight.
Once the boss is dead, you will be able to pickup loot and badges on char B straight away, and then relog char A and receive badges and loot also.
If for any reason your logout gets interupted when pulling the boss, u can also die, and logout. Then log your other char back in.