it s funny. good job.
for me it s really interesting watch how no-melee groups do it.
LoS startegy vs waves is the typical strategy?
i ve found, gearing up a bit, i can manage waves avoiding CC with paladins grp. more dangerous, but more fun. paladins have a great advantage in this part, with their CC, repent and HW chain and HoJ chain.

the final escape looks really good managed.
with full melee grp, main problem is the abomination's cleave(melee dmg in frontal cone)ability and spit-dot ability (you win really high instant dmg and a debuff if too close).
shadow bolt volleys are dangerous, but main goal for me is keep abominations facing away from dpses, for ranged classes main goal seems be kill the shadow casters.
interesting to watch