DK - Death grip only works on targets out of combat.
Warrior - As soon as you reach your target, the expected 1st melee swing would not start, client's red warning message: " You are facing the wrong way".
I made a mistake by not including "charge" in the post , what i meant was as soon as you reach the target with the "charge" ability , the warrior is not going to start his melee auto attacks, melee spells work fine as long as you have enough rage.