Turn Undead

I was able to practice turn undead even though I am an evil shaman. I thought perhaps it would do something similar to what a necromancer could do when repelling undead. I cannot even use it even though it lets me practice this. I believe I shouldn't be able to practice it if I cannot use it. Log follows. Level 15: cure blindness 63% 5 mana curse 66% 20 mana plague 86% 20 mana Level 16: protective shield 80% 70 mana Level 17: faerie fog 72% 12 mana tsunami 65% 25 mana Level 18: cure disease 68% 20 mana Level 19: energy drain 69% 35 mana Level 20: frenzy 98% 30 mana damnation 72% 25 mana Level 21: fatigue 71% 35 mana Level 22: turn undead 64% 35 mana Level 23: fervor 85% 50 mana Level 24: sanctuary 91% 75 mana Level 25: cancellation 64% 20 mana Level 26: redemption 63% 40 mana Level 27: locate object 68% 20 mana Level 28: word of recall 75% 40 mana Level 29: holy word 63% 100 mana identify 90% 12 mana Level 34: demonfire 94% 20 mana [Hit Return to continue] Level 38: aristaeia 65% 200 mana Level 40: wither 75% 175 mana Level 42: rot 77% 50 mana 786hp/786hp(100%) 486m/794m(61%) 619mv/672mv(92%) 9864tnl (51.65%) com 'turn undead In your dreams, or what? 786hp/786hp(100%) 607m/794m(76%) 672mv/672mv(100%) 9864tnl (51.65%) stand You wake and stand up. 786hp/786hp(100%) 607m/794m(76%) 672mv/672mv(100%) 9864tnl (51.65%) com 'turn undead You lost your concentration. 786hp/786hp(100%) 590m/794m(74%) 672mv/672mv(100%) 9864tnl (51.65%) com 'turn undead Only those who walk in the light may turn the undead.