Hot air balloons have no mobility; their movement depends entirely on the wind. It's winter now, and the winds are mostly from the north.
To travel against the wind, one must ascend to different altitudes to find a suitable wind layer, and finding a suitable one is entirely a matter of luck. The escort team was clearly having bad luck; they had been trying for days without finding a suitable wind layer, and therefore couldn't cross the Nine-Linked Ditch.
"If we can't cross the Nine-Linked Ditch, we'll take another route!"
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