Lu Zhen and Leng Pan noticed this small movement of course, but they didn't say anything or ask. They assumed that their assumptions were correct.
Them being in contact with the meteorite somehow helped the others to improve.
Upon thinking about this, Lu Zhen looked around and didn't see his brother, he turned to give Leng Pan a look who understood immediately.
No words were needed between them. They could understand each other with a single glance. This shows how much their bond had grown.
Leng Pan went to sit between her mother-in-law and aunt and let them experience the benefits of being close to the meteorite up close.
Lu Zhen on the other hand, went to Lu Tao's room to look for him. Even though he wasn't the one who touched the catalyst core, the simple act of holding Leng Pan's hand had transferred enough residue to him to activate his fire ability.
It was also enough for his brother to stay close to him for a while.