Wow, that warlock was an idiot.
O_O
...
Anyways, he used some spells, however, most warlocks summon a VW, or Imp to take hits while they launch DoT's at the enemy. The guy you watched fight the crocodile was some disoriented moron with epilepsy (or somewhere along those lines), and Kerik was correct he did not use the same motion everytime.