No other Ruling Sword member attacked Immortal. Because she was pursuing Lu Li, she was already too far away from Moonlight and the others.
As such, they changed their target to Falling Smile.
Falling Smile was protected quite well. Peerless City used this strategy to lure and kill many players who went after their Healers. However, now that Lu Li had made a mistake which resulted in Ruling Sword losing control of the match, they decided to focus on him first.
Immortal's discovery of Lu Li's weakness was not a mere stab in the dark.
They practiced a lot in this map and found that Thieves would leave traces of their movements behind. This was how Immortal managed to catch Lu Li.
She should have been proud of herself. After all, not many could achieve what she had done.
However, Lu Li was harder to kill than they thought. She could only watch as he got healed again and again, despite reaching 50% HP.