Here's the thing that both parties are doing incorrectly:
1. Main group:
+ They don't know MC's true strength yet, so sending people in like that will just be sacrificing people for no reason. And since every single person in there is a murderer, you wont be getting the moral high grounds any time soon.
+ Forcing a person to share their resources doesn't make for a good impression. If anything, it'll just harbor hostility, not great for recruiting.
2. Side group/MC:
+ You are supposed to be very keen on what is happening/what happened. the MC, at the very least, has to know where's safe and where's not, and this situation cannot be considered "safe" despite being in a safe zone.
+ Showing your weak side to a stranger, who fully intended to use you since the very beginning is not a good move (not telling the guy to fuck off after he tried to take your food).
If you're OP enough, get your people out there fast. A single person can only do so much, so don't be a hero unless you fully intend to take over and change command.
And the soldier, come on man, Korean soldiers arent supposed to be push-overs.