Ambush?

We raced through the current. Certain doom waited before us. We speculated the necromancers wielding blue and black aura had prepared an ambush. Their zombies would be armed with spears, decaying buffs, and enchantments. Far from the battle line the sharks would wait circling ready to act in moments of weakness. If one of us fell they'd raise them to attack the other. When our backs are turned to fight their raised dead, they'd attack. This was the strategy of the necromancer. They attacked when unexpected and stayed well away from the line of fire. Even sharks couldn't avoid tactics of the necromancer.