Such is the way of war.
A prior knowledge of the canyons and the Force help you get through relatively quickly, but the Grotos stay hot on your trail with dropships hovering overhead and troops behind you. But then you reach the chokepoint, where some of the paths meet... and where Sparnik has four automated cannons guarding the entrance to the hidden lair! When you leap past with Sparnik, they are alerted to the presence of your pursuers and they fire off a series of volleys that close off the paths behind you. You vanished into the caverns and your escape is made good.
In the cool of the cave, a few of the militiamen have stayed behind to meet you.
"Are there no others?" one of them asks, seeing you carrying the unmoving Sparnik.