This is it (not dropping, that's the chapter's name...)

"If I knew how long it's going to take, I would much rather park it on the other side…" 

Despite Claudy's many requests to hurry it up, we still spent roughly a quarter of an hour climbing up the relatively easier incline, a few miles down from the massive dam. Our speed accelerated only once we reached the narrow plateau aligned with the top of the damn-turned-fortress, from where we took a further ten minutes to ride the gentler parts of the slope down. 

In total, from when we first heard Claudy's call, it took us nearly thirty minutes to arrive, taking into account the time it took us to land and then move up to where he asked us to come. 

"So? What seems to be the problem?" I asked as soon as I stepped out to a small platform, located all the way at the deepest end of the second wall of the fortress. 

It lay beyond the gate, several tens of meters beyond the last point anyone would ever bother assaulting. And yet…