MSQ "Feats of Strength"

Time: Any
Frequency: Always
Area and coordinates: Coerthas Central Highlands X: 26.7 Y: 17.4

When doing the main story quest, "Feats of Strength," given by Haurchefant at the area and coordinates provided, there are three knights that you must defeat. Two of the knights properly kneel when defeated, one however just drops dead. This may not actually be a bug, perhaps it is intended, but I can't figure out why so am posting this just in case.

Steps:
1. Accept the quest "Feats of Strength" in Coerthas.
2. Defeat the 3 knights.
3. Take notice that 2 knights kneel after defeat (correct) and one just drops dead like a normal kill (likely not correct).

Just graphical, but I've seen it multiple times (multiple re-rolls) so figured to report it.