I went in there just to have a look.
It was even funnier then you described!

I wanted to get a few Bolt Action/Cloak kills for the Snipe from the Shadows Pursuit.
Everytime I got a bead on their head for the killshot, they immediately ran away or behind something.
When the Monitor activated his shield, they were all standing behind it!
I was like, okay, there's 5 of you
and the Monitor in that tiny space, isn't a bit crowded?
One of Dark Matter actually worked up the courage to face me uno-on-solo and as soon as I depleted his shield (I used a sword) he immediately went scurrying back to the others!
C'mon, you have a laser gun, I have a metal blade and you're still running away?
The only time they actually wanted to fight me was when they green buffed up, all other times, they avoided combat.