Why did I get a DHK

Hello,

I noticed I received a Dishonorable Kill on my character Huskèr (Nightslayer realm), but I’m unsure how or when it occurred.

Timeline:

After raid Saturday evening (CST), I farmed Demonic Runes in Azshara.
Hearthed to Orgrimmar and logged off.
Logged in the next day to do AH and misc. tasks.
Went to DMF for the buff. Attempted to kill an Alliance priest, but they LIP’d and entered a BG queue—no kill occurred.
Hearthed back to Orgrimmar.
Took zeppelin to Grom’gol, flew to Kargath.
Waited 20–30 mins for an LBRS group.
Joined group, ran to Blackrock Spire.
While walking toward the chain in BRS, I purged a mage’s buffs so others could kill him.
Entered LBRS, then noticed the DHK.
Asked group members—none had received a DHK.

Could you please investigate and clarify:

When and where the DHK occurred?
What NPC or mechanic triggered it?
Why I received the DHK?

I want to understand how this happened and ensure I’m not being unfairly penalized.

I submitted a support ticket regarding an unexplained Dishonorable Kill on my character Huskèr (Nightslayer realm). The ticket number is, US105081674. Support redirected me to the forums but didn’t specify where exactly I should post to get help.

If this is not the correct section, could someone please let me know the right place to dispute or get clarification on this DHK? I just want to understand when and how it happened, since I have no reason to believe I did anything that would trigger it.

Thank you for your time and guidance.
Huskèr – Nightslayer-Classic Anniversary