I got this in my second game of survivor, in offline mode. I just kept killing the aliens and then running in to allow their blood to get on me so i lost a small amount of health for that one bar, and it would regenerate pretty fast. I was counting them and I was pretty sure I was up to more like 45 by the time it popped.
I was starting to think I had to use a stim to replace a completely gone energy block, but I'm fairly sure I only did a couple of those.
__________________
|