Now that the duo had received another attack, they seemed to be warier of their surroundings and situation. They weren't wary of Eric, but wary of each other now.
That first attack was supposed to be Eric's lifeline counterattack, and they had already suffered a lot. And in this situation, their accomplice had tried to take the opportunity to kill them.
This was just enough to understand the danger that was surrounding them, as they both wanted nothing less than the other to die.
With these thoughts in mind, they stayed in silent confrontation for a few minutes, with none of them making the move, which clearly stressed and disappointed Eric.
While he wanted to leave them to their own fight, he felt that he would have to wait a lot in order for this to come to an end, so he started talking in a mocking voice at them.