Luo'er had previously planned to launch a full attack on these people, to completely sever Fu'en's intentions of teleporting back to Earth. Now, seeing Azita, his desire to do so grew even stronger.
If it hadn't been for this guy, the advance team would not have been ambushed, and they wouldn't have lost Fu'en. After much thought, Luo'er believed that besides his own recklessness, Azita's betrayal was a crucial factor in their last mistake.
Combining old grudges and new, Luo'er planned to take direct action earlier, destroying their base altogether and eliminating the enemies' way back to Earth.
This time, he wasn't acting on his own, as the headquarters had ordered the advance team to strike when the opportunity was right, ideally capturing the whole group. For Luo'er, when he saw Azita appear, he knew that the opportunity had come.