Bears do a crunch armor -20k armor and enrage for double attack speed.
Warbringers(riding bears) do furious roar increasing damage 50%, they cleave and they do a frenzy for 30% attack speed and increased physical. (they can also be stunned around 35% to prevent them summoning their bear on dismounting)
Axe throwers do a 2sec knockdown(big impact when tanking other things, zero mitigation)
Medicine men do healing ward, protective ward and chain heal.
Even though it's normal to think of CCing the healer it actually makes more impact CCing the axe thrower that can knock down tank during the other mobs high damage abilities.