they will attack you randomly sometimes not at all one easy and medium and lower lvl refinery you wanna jus run around infront of turrets in hopes of zombies attacking you once or twice before attacking turrets giving them a little extra time without taking damage, it adds up by the end of the wave.
when debuff refreshed I got 1. enemies attack restores their health 2. zombies damage increases when their health is under 30% 3. zombies damage increases with every missing health point. this made my method for last wave (hard threat) not possible so how I did it was same exact thing but stood in middle with minigun used about 3/4 durability of it and completed it no problem
yes, I will upload 2nd wave lvl4 3rd wave I did not record I messed up recording but in all honesty 3rd wave I died first time due to debuffs the zombies was too strong at low hp and instakilled me when they was low hp , I ended up doing same strategy all lvl1 turrets but I had minigun and stood in middle of turrets by refinery and just kept shooting, worked no problem used about a little more than half durability and only had to heal twice they never even reached me for most part.
EXTRACTION EVENT EASY MODE (NO GUNS NEEDED) Setup: Military Armour, Melee Weapon(optional) few stacks of carrots and few stacks of bandages, good amount of iron bars, and LOTS of minerals(acquired from every zombie you kill) Method: PLACE MAXIMUM ANOUNT OF LV1 TURRETS! (surrounding the refinery) run around infront of turrets attracting zombies to hit you before they hit the turrets, giving the turrets extra time with taking no damage (it adds up at the end they amount of hits you saved them from) also once sniper support is available to use i recommend using it, activate as soon as first mob of zombies is on screen, don’t wait too long to activate orr you’ll waste time you could of had with it activated as it lasts 50 seconds. REASONING TURRET>BARRIER turrets last longer than barrier while under attack and during this time turret also deals damage and barrier does not so much more beneficial to have all turrets