Nostalrius Begins - Quality wow vanilla realm (1.12)

Lt grummus was able to be shackled by my priest countless times, but LT Murp was considered an invalid target on shackle undead.
Both targets are considered undead creatures and said so in the tooltip mouse over as well.
Not sure what the original classification was for these mobs but some servers had both considered undead.

arent those elites in AV supposed to be CC immune? just asking, not sure about this

At one point it was possible

"Unlike the Forsaken serving the Horde who are classified as humanoid, Grummus was susceptible to anti-undead spells like Turn Undead. "

http://www.wowwiki.com/Lieutenant_Grummus

Fixed.