Yeah, a rooted mob on live would always attack the nearest target, regardless of agro. You could keep agro on a mob indefinitely by having melee dps fight at max melee range and the tank stand right next to the mob while it was rooted. This wasn't really common practice due to breaking roots and it being ineffective on raid mobs though.
The summoning thing seems off though, I would think that normally, every summon cycle (every 6 seconds maybe?) it would summon the person highest on the agro list.
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