"It's nothing"

The gas had also affected Richard, and Wilder, who was already suffering from the silver and wolfsbane poisoning. As soon as Richard took notice, he tore out a part of his dress and handed it to Wilder to cover the lower half of his face while he did the same for himself. 

With the assassins still struggling to run away but too weak to even move, Wilder took the chance, racing into the poisonous smoke with his sword, and Richard followed with his sword too. 

He didn't care that it was a dishonourable thing to do since his opponents were down since they had started it first with 15 men attacking two of them. 

When they both succeeded in killing all of them, they escaped from the smoke and saw a sight that made them pause.