I was more worried about the crawlers. The knights you can see. You can watch them and get in cover if needed. The crawlers are EVERYWHERE, never have to reload and often carry binary rifles. You can't get in cover when there's 4 of them chasing you, and without a precision weapon (which they never drop) it's a pain to kill them since you can't get headshots with a suppressor.
Don't they regularly drop boltshots? You can get insta-kill headshots with that. --- "Sir, I don't think I'd care to look at a nun's legs. It'd be very impolite." "You'll just have to force yourself Godfrey. This is war!"
Suppressor eats Knights for breakfast. As long as they're only armed with Loadout weapons (a majority are, even on Legendary), you usually can safely rush one head on. I usually try to kill most of the Crawlers in the area before I try taking on the Knights, as it makes finding and dealing with the Knights after they teleport away easier. --- "Dad! I'm in space!" "I'm proud of you, son". "Dad, are you space?" "Yes, now we are a family again".