The glazed eyes, calm expected look, and intense energy he was feeling coming from this human warrior all indicate only one thing that was a huge danger. He couldn't stop his body midway therefore nothing could be done instead of facing it head-on. He braced his heart as he unleashed his full ability to tackle whatever she was trying to do.
He was cursing himself several times in his heart right now. How could he have fallen into this trap so easily? He then understood that it was all due to recent success that has gotten into his head. He was so giddy in his feat that he forgot to determine even a single precautionary check on this warrior.
He instead of scanning if she was faking it or unconscious. If she was really injured badly or was trying to ambush him. He walked straight over her walking onto the live bomb. It was because of this fatal mistake, she was able to catch him off guard.