I'll assume you are a mage. What you could do, before locating the butcher, is find the stairs to lvl3. Then, find the butcher, open his door, and run towards the lvl3 stairs. Make him chase you around the stairs. There is a point where he will get stuck in the stairs to lvl3. At that time, you fire away. Or buy a few scrolls of firewall and cast it on him while he is stuck there. Also, you could open the door, cast firewall just inside parallel to the wall, as close to the door as possible, then close the door.
For more strats + details, you can go to Freshman Diablo: http://www.arewehavingfunyet.com/diablo/diablo.shtml
Click on Butcher Bashing 101 (http://www.arewehavingfunyet.com/diablo/butcher.txt)
For more strats + details, you can go to Freshman Diablo: http://www.arewehavingfunyet.com/diablo/diablo.shtml
Click on Butcher Bashing 101 (http://www.arewehavingfunyet.com/diablo/butcher.txt)