The mobs don't INSTANTLY deaggro, which means that sometimes their summon is ready to fire off in that brief moment when charm drops but before the in/out water shenanigans resets them.
I.e. if one of the mobs is below 97%, hasn't used its summon in the last 10 seconds, and has a melee swing ready to go (summons don't seem to fire, ime, when all the mob's melee attacks are on swing timers, which you can see easily on a 75% slowed mob)... you might still get summoned down into the water even if you were up on dry land.
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