Prior to Adam throwing a punch at Nie Yiyi, she had already lashed out at him with her blades, and one of them struck Adam on the neck, while the other struck him on the waist.

Thankfully, Adam was fused with Mummy at the moment, so the two blade strikes from Nie Yiyi did nothing aside from raising some sparks and causing some minor pain.

At the same time, a projectile from a sniper cannon just so happened to strike him on the waist, instantly blowing a large hole into his body.

The pain allowed Adam to temporarily return to his senses, and the ignorance that was clouding his judgment faded to allow him to properly assess the situation.

Why am I attacking her? Why is she attacking me? Am I under someone else's control?  

Even though his mind still wasn't very clear, Adam immediately threw his arms around Nie Yiyi before pressing her down...