Use the /petattack kill to boost!

Have someone group your lowbie, even if that person is in Shatt and level 70.

Have your warrior tag mobs his level of exp, up to +5 levels.

Now, have your Hunter assist but not attack himself, except for the pet.

Go to Interface option, UNcheck the Attack on Assist.
make a macro on hunter:
/assist (your warrior's name)
/petattack.

Make sure you are not grouped with your hunter.
But make sure your lowbie is grouped somehow, even with any low level noobs around; or with a level 70 no in xp range.
win!