1753 Fish a Needle from the Sea 4yr

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It would soon come to the vast vacant space out of the territory of Nine Heavens Big Domain if it kept going northwards from Redmountain City. 
However, suppose the airboat's speed was about 800 miles per hour. As the catastrophe facing Ying Clan's castle had just happened over 6 hours, it means the airboat had just moved about 5,000 miles. 
'If that airboat keeps moving northwards, I could catch up with it.'
After reaching this conclusion, Zhang Tie instantly triggered his invisible shen beard as he set off the crown and shot like a lightning bolt towards the direction where the owl saw. 
When Zhang Tie left there, he looked back as he found that an airboat with the symbol of Force Emperor Immortal Palace had just reached about 300 miles away from Redmountain City. Zhang Tie estimated that the powers assigned by Force Emperor Immortal Palace would soon arrive at Redmountain City. 
Zhang Tie kept moving northwards in the air as fast as a lightning bolt. At the same time, he starte