He had broken his own speed record.
The sky was his dominion and for a fall from this height, there was more than enough time for him to catch her. In fact, he could have let her fall for a bit longer to teach her lesson. But without even giving himself time to consider this, he had immediately dashed out. He had even started to doubt his abilities, deeply fearful that his grip on Elvis was not secure enough and that he might drop Elvis and Gu Mengmeng…
The wound on Elvis' back was the best evidence of his doubts and fear then.
He didn't know how his level of anxiety compared to Elvis' and Lea's, he just knew that he did not dare to leave the cave entrance at all as he was afraid she might jump again.
He said he would only rescue one partner if she jumped again, and then not rescue the remaining one if she jumped a third time.
But he didn't dare to say that he would not even save her if she jumped a fourth time.