i would like to know it too. but i guess, just go there until he becomes calm. and maybe you will finish it with luck.
if lots are teleported out just bsoe fast and re-enter. if blue warp appears, just assist on minions and kill them fast until warp disapear. then focus again on balok. no mystery.
since i play 95% of the players always failed on minions. when i was with my clan and 1 more random party we commanded them to not fail it stay inside w/o not resetting it. that was before ertheia.
those big mobs which are invulnerable at beggining drops keys for doors inside ure locked ... and dont think balok is changed ?
it's done the same way before ertheia. everybody goes to the center. no aoe, no clones, no poison cloud. once you start hitting, no one moves, just hit. the very moment balock casts imprison no one hits anyhow till the one who gets imprisoned has done bsoe and reentered. end.
or easier way, get 4 wynns and he won't imprison anyone, he will be targeting pets, which cannot be improsioned
everyone has 'best' method, that relies on "hey noobs, somehow i made it, so only my way is 100% correct" 1* just look where the balok is lured whenever it moves, because if he moves he heads to the 'cage' with 'imprisoned' guy. most of the time the guy in cage, simply delay to use bsoe. 2* #syzgod is right because... ...does not mean 'fail'. aoe skills works great, especially mass giant root. conclusion: everything else than this i consider as bul**** and nothing offensive, reffering to in-game myths and legends : http://www.nyperformingartistco.org/gyp_ytales.htm
already failed when you got minions. possible to finish only ppl have to do their job. short version, do it with your cp. if you dont have cp find one.