The Japanese selling Dream Island, Haruji Harada, jumped out at this time, challenging Yan Fei's ownership of Dream Island, so in order to kill the chicken to scare the monkey, Yan Fei certainly wouldn't let him go. Yan Fei's purpose was to use this Japanese to force the lieutenant colonel to come out, then he would have a big fight with the lieutenant colonel, deciding the victory or defeat once and for all.
Yan Fei was very clear that the lieutenant colonel was a renowned god-level expert with various life-saving means, so even if he couldn't beat Yan Fei, he wouldn't be killed by Yan Fei that easily. Yan Fei's goal was to warn other god-level experts not to covet Dream Island otherwise Yan Fei would definitely not let them go.