Can any of you think of an instance where an ambassador travels cross country to get between capitals?
even though the question was addressed only to the honest and rational, I'll invite myself and speculate that the ambassador was going to visit some places in between the two capitals. Those places could be the areas affected by the insurgency (officials do go there, it's not like "It's dangerous out there, let the folks deal with it on their own"), could be military stations, or maybe he had to meet some elders for talks, or a delegation from Afghanistan. Maybe there was a meeting scheduled between Afghan officials and Pak officials in the border areas to persuade the local elders to abdicate insurgents. Not that I have a money bet staked on the issue.