Tolik is the guy in cordon near the dead guy calling for you to help him, you give him the medkit and he becomes a friend.
as to the freedom duty argument encyclopedia says
<string id="enc_social_stalker-clans_duty">
<text>A paramilitary group known for its discipline, whose members live according to a strict code. Duty members are the only group to refuse to trade unique items from the Zone with the outside world. According to rumors, all artifacts found by the group are passed on to scientists. Its members consider protecting the outside world from the Zone's dangers their primary objective. Most of the group's operations concern destroying monsters, hence Duty raids often save normal stalkers from serious trouble. The faction has long been at war with Freedom.</text>
</string>
<string id="enc_social_stalker-clans_freedom">
<text>Anarchists and daredevils who declare themselves fighters for a free access to the Zone and consequently find themselves in constant conflict with the army, military stalkers and the Duty faction. These so-called freedom warriors believe in sharing all information about the Zone with the rest of the world and challenge the state's monopoly over the Zone's secrets and wonders.</text>
</string>
but....
<string id="bar_bar_osvedomitel_talk_about_freedom_1">
<text>Sure, no problem! Freedom is one of the oldest groups in the Zone and the only one that openly opposes government troops and research teams. Its founders are dead - they were killed during a big bloodbath after the army dropped a large assault force in the Zone but the ability to control the Zone from outside was destroyed at the same time. There is some evidence to suggest that the first Zone was used as a secret army weapons' testing site . If that's true, they must have used some powerful shit.Anyway, what was I saying...? Oh yeah, Freedom is the only group that is trying to stop the government from gaining control over the testing site again. God knows what will happen if they start testing their shit again, so Freedom is trying to hold out at all costs.</text>
</string>
string id="bar_bar_osvedomitel_talk_about_freedom_3">
<text>Duty is basically controlled from the outside by the government. Their current objective is to clear the territory of mutants and destroy Freedom, which is what they are doing at the moment. When the time is right, they will drop a large assault force in the Zone and take control of the area.</text>
</string>
back on NPC companion/allies a lot want to mod them in (including myself) but are unsure if we are able to do so before SDK.