Running
Thanks to Number Two's cultivation, he was able to find Number One's body right after picking up Mira. He was both unconscious and severely injured, with a deep cut in his abdomen and many of his bones fractured or broken, but he was still alive.
The only reason he fainted was that he bore the brunt of the explosion caused by his and Mira's collision. He wasn't expecting Mira to be able to have so much power behind her attack, nor did he expect to encounter a very sturdy shield to form around Mira at the last second, which was the main reason for the large impact.
Number Two would've loved to help Number One deal with his injuries as he might actually die if he doesn't receive treatment or regain consciousness here soon, but unfortunately, the situation didn't allow him to do so.