Kill the sniper on the tower

Cherep, the rogue Duty commander Voronin warned you about in Get RG-6 from "Freedom", wants you to get rid of a Freedom sniper.
== Walkthrough ==
Once you enter the Army Warehouses the first time, you'll be greeted by a scene of a Freedom patrol getting ambushed and killed by a Duty squad. You can talk to one of them; you will be asked to be discrete about what you've seen. If you disagree, Dutiers will attack you immediately. If you agree, you'll be directed to the [ abandoned farmstead] nearby, where Cherep's group gathered to assault the Freedom base.
Cherep will ask you to kill the Freedom sniper who is watching them from the nearest watchtower, before they attack the base. You can agree and do this; after turning the quest in to Cherep, Freedom will become hostile to you. Cherep will task you with eliminating Freedom snipers.
Alternatively, after accepting the quest you can inform Lukash, Freedom leader, about Cherep's plans.
== Notes ==
* OP-2 is huge, and unlike in vanilla SoC where you can just ignore everyone and rush certain plot milestones, a great portion of the game revolves around Freedom. Not informing Lukash during this quest and making Freedom hostile essentially means breaking most of your game, unless you bribe them through Sidorovich later.
* Since Cherep is a traitor to Duty, you can just murder him and his group in cold blood on the spot, without any reputation drop or repercussions from Duty. Moreover, Cherep himself won't bat an eye if you kill his group directly; you'll still be able to get this quest from him.
* If Lukash has been informed, this quest will end later without failing, so it won't affect your S.T.A.L.K.E.R. achievement.
* You don't have to take this quest to warn Lukash, neither do any of the Dutiers need staying alive.
== Bugs ==