In Ashenvale there are satyrs (Hellcallers) in an area known as Satyrnaar that have demon pets . Well, if you enslave the satyrs who have a pet, their pet will go into an evade mode and reset every second.
They will continue resetting until you lose control of the enslaved satyr, or you accidentally one-hit it. The voidwalker are preferrable because they have more HP. Using a lower level weapon will decrease the likelihood of accidentally one-hitting it, but I never one-hit it with a ilevel 232 dagger.
I'm fairly certain there are satyrs with pets in higher level zones, so you could also do this to them.
This is an easy way to level any weaponskill simply because you'll never take enough damage to die if you have Fel Armor up, but you have to re-enslave your satyr every 5 minutes.
One other note: IF you aggro the satyr's pet before enslaving the satyr, this will not work. So let it evade bug and get away from it if your enslave is about to end, and then re-enslave.