Miscellaneous: Why did I get aggrod?

[Tecmos Deception]

So I was just in HS, making my way into south. Just beyond the fake painting dropdown spot in south, there are 3 static spawns and 1 pather. Immediately below the painting were 2 goos, the static spawn over near the ramp down was a skeleton, and the pather was a skeleton too. I ran through the painting, aggrod the 2 goos and the pather but did not get the second skeleton (the static spawn from over near the ramp) aggrod on me.

I stunned the 3, mezzed them, memmed tash and bedlam, tashed, mezzed again, bedlam, memmed rune and ivu, mezzed again, fettered all 3, runed, mezzed again, IVUd. So it took probably 90+ seconds to do all that. Still no aggro from the second skeleton.

I ran around the corner IVU and started camping out partway down the ramp where I would be out of line of sight of the two goos when I came back in. Still no aggro. Then, with 10 seconds left to camp out, the static skeleton aggrod me, HTed, caused me to get 2 more adds, so I hatted. I was still IVU until he HTed me. The 3 mobs I had aggrod over near the painting, which had not caused this second skeleton to aggro me for a couple of minutes now, were still in the exact same spots they'd been in (they were all still rooted) for the last couple minutes. The other two mobs near me down the ramp were both undead.


Why the hell did that mob aggro me?