You fight a Trainer Scorpion its much harder than the Crab or Bat, and can do over 1000 dmg to the NPC.
Trained Scorpion is actually extremely powerful. Death Scissors did 1400 to a level 63PLD. AoEs (Wild Rage, and Earth Pounder) were doing 300~400 to 75 players. And all together had a very large amount of HP.