Goblin Shaman 3 cast of astral and then attack?

[BB Shockwave]

I think you only need to worry about Orc Blood Shamans (the title is wrong, it's not Goblins) if there are other stacks of Shaman in the group. Only Blood and regular Shaman increase the adrenaline level of other orc stacks when attacking. Killing a troop does not matter, even one spirit strike or ghost axe attack from a shaman raises the adrenaline level of other shaman, meaning they'll do more damage with this skill next time. But, that won't happen until 2-3 more turns, until which time you can disable or kill them.