Brother

"Impossible," said the assassin. His face was filled with terror as he'd never seen something like this.

His comrades were killed one by one without him being able to do anything. A big move certainly required time to set up, but he should be able to use it once or twice. 

Yet, every time he poured that amount of Magic Power to escape from this predicament, he would be stopped by someone. And to make the matter worse, all his comrades experienced the same situation. No one was able to use something big to disrupt the flow of the battle.

And they ended up getting killed one by one after Boris and the others had more time to deal with them because of the loss of the mage. 

The assassin gritted his teeth. He expected that if they wished to kill Boris and the others, it wouldn't be that big of a problem. After all, they came here with the intention to die.