The cool down on the evasive disc is such that, in the aforementioned scenario all of the spiders in the front half of velks are cleared before repop, with a cool down timer commensurate for repeatedly accomplishing this goal. There are not unlimited mobs to continue pulling without encroaching on others' "camp", so the difference between the knight pulling 3 or 4 at a time, and a warrior pulling 30 or 40 is rewarded with additional AFK time between repops
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