As for the potential actions of the "mutated big bird", Xiang Kun wasn't very confident about it acting in accordance with his prediction, due to scarce direct observations and insufficient information for making judgments.
Even though he didn't look back, while climbing higher, he was conscientiously monitoring the movements in the direction of the "mutated big bird".
From its sound, it had not left its original location, neither had it flown nor changed its spot.
Even though it did not follow, it was a good start.
Not leaving meant it was still observing.
He believed that as long as the bird did not run away, then it would definitely be curious about what he was doing and would eventually come over. Once it did, it would fall into his trap.
The more cautious it was, the longer it took, the more advantageous it was for Xiang Kun, and the fewer chances it would have to escape.