I didn’t find using the torch made a difference at all to stealth and this is laughably bad. That quest where you had to stealth is about timing, noise (stay low) and staying out line of sight. Watch the enemy patrol patterns.
I was convinced stealth was totally broken (instead of just slightly broken) but the more I understand its nuances the better it seems to get. Like real life “sneaking” towards an enemy in line of sight is not really sneaking, even if you think you are perfectly hidden behind a bush. Similarly stealth is even more reliant on sound, just because they can’t see you doesn’t mean they can’t hear you. Watch that blue noise meter under the compass.
No it’s not perfect because weather and darkness don’t seem to affect stealth (I hope they fix this) but some basic rules apply.
- You need to take down enemies very quickly with a suppressed weapon. If they call out at all, even groan in pain, it will alert enemies to their position.
- Killing someone in LOS of another enemy will instantly alert them to your approximate position and will most likely (but not necessarily) turn the stealth bar red and alert others. They will investigate or even throw a grenade to the likely area their buddy was shot from.
- If an enemy spots a dead body (but not the actual kill), they investigate without going agro but only if you remain out of LOS and keep noise low.
- Once alerted (red stealth bar) they stay alerted. None of this “hey bob just got killed, lets look for his killer for 30 seconds then forget Bob existed and ignore his body”.
- If it doesn’t have a hit box, it doesn’t remotely block LOS. This is why bushes do nothing.
- LOS seems to be looking forward (duh) and extends right to the limit of the visibility range. If you can seem them they can see you.
Stick to these tips and you can clear out a base of bandits without being spotted. Though it is difficult if there is 3 or 4 enemies spread out and covering lines of sight. I have seen enemies throw grenades, rush and flank my last known position and still had my stealth bar remain blue and undetected. But ONLY if nobody was in direct LOS of where you took the kill from.