Vengeance

Sidorovich contacted you and told you the location of Sanyok the Brigand, the scammer who scammed you in Sidorovich's "Debt" using Sidorovich's name. He should be somewhere around the outskirts of Zaton, and you'd better head towards there quick to settle the matters.
This quest is unmarked and doesn't have any canonical name.
Part of this quest is timed: you have to find the scammer in 24 hours, or he will disappear and you'll lose this quest.
== Walkthrough ==
=== Sanyok the Brigand ===
Sanyok can be found in the north of the location, at the [ campfire], along with other stalkers. Speak to him. He will tell you a sad story and will promise to give you the money back, along with some info.
Follow him to the [ dangerous cave]. He will ask you to wait outside for him to get the money. He will run into the cave and vanish, after using the manual teleport. After that, Sanyok will contact you over radio, laughing at your gullibility.
=== Vengeance ===
Roma Romale, one of the stalkers around the campfire where you met Sanyok, will contact you and ask you to meet him. Get back to the campfire. Roma will say that Sanyok is a real scumbag; he knows where Sanyok is, and wants to help you with dealing with him.
Follow Roma across the entire location, helping him fight mutants along the way. He will lead you to the area behind the [ substation workshops], where you meet Sanyok the Brigand along with his small group.
After a brief talk at a distance, approach Sanyok and talk to him. He will attempt to scam you again, for 200000RU. Regardless of whether you pay him, you will fight him and his group.
Attempting to leave the substation workshops with Roma will spawn several groups of bandits around; you will have to fight them as well. Roma will run for some time and stop. Talk to him. He will thank you and show you the route from Zaton to Jupiter, and tell you the location of his stash near the [ stalker campfire] - "behind the rock, under the first bush".
After the quest, Roma will travel to [ Shevchenko] and stay with Arkhara.
== Notes ==
* Entering the cave before getting the derisive message from Sanyok teleports you to the forestry where about 30 zombified stalkers are hanging out.
* Roma Romale seems to be invulnerable but often gets stuck after combat.
* The Colt M16A2 is one of the very few accurate guns in 5.56x45mm and is also the final requirement for Skinflint's chain quest.
*Don't miss the [ bonus stash in the cave] that Sanyok escapes through initially - it has a Barrett M95 sniper rifle inside of it.
== Bugs ==
* When running to the dangerous cave, Sanyok will pass through a bloodsucker camp with the possibility to be killed by them; the camp is in the middle of the swamp and you will be slowed down there, unlike Sanyok.
* After fighting the bandits, Roma will appear to be stuck, unable to talk. Getting 160m away from him so he switches offline, then returning back to the substation workshops seems to fix the issue.
* The final showdown with Sanyok and his group takes place in a spawning spot for Wehrmacht soldiers. Sanyok can be killed by them before you even have a chance to approach, softlocking the quest completely. Clear out the area before speaking to Roma to ensure this doesn't happen.