That lookout really knows his job. He doesn't let you do anything.
Maybe if he would think the fewlocks are coming.
There is an alarm system in the future.
I mean in the future area. Right and down from the city center. Kick the siren. You have until the clock ticks out to do your thing at the Elysium cluster.
NOTE! There is a known bug with the timer. It should not run out in seconds!