Just played the mission on Legendary and the last objective is to clear the extraction point. Well, the problem is that 2 enemies are stuck inside a structure on one of the first 2 ramps from the initial spawn. I was able to kill a knight with a shotgun when his limbs would poke through, but the watcher and crawler (judging from the SFX they make) are too small. I tried pulse grenades thinking that the radius would go through the ramp but no luck.
Just thought people should keep an eye out and restart the mission right away rather than waste the added time like I did… lol