Good find, at the very least seems it should be AoE dispel and high MR mob.
In regards to more targets being hit i'm not sure. 2 people get dispel while it seems debuffing is going on. Very common to have MA / SA next to each other on a mob back then.
Also notice Ravihn casts ensnare and it lands (1.75 sec cast time) . Chest is then facing Ravihn in screenshot (assuming he got agro). A lot could happen to positioning in 2 secs in hate. MA being summoned could also have changed mob position.
Could very well be a small radius Targeted AE like Phobocancel.
You mentioned log snippets on some sites, can you link them? I always flag old log links to mine for classic data
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