Spoilers for the mission "Death Factory" below..... YOU'VE BEEN WARNED.
Okay, so I've scraped struggled and clawed my way to get through hard mode with suit only and its been hard... really hard but I've done it so far. Yet the R&D section of the "Death Factory" level seems to be almost impossible.
If you've beaten it with both the infiltrator and suit only bonuses I really wanna know how. I've tried sneaking over to the valve on the far side to cause steam to go everywhere the problem here is that well.. the "patient" sees you and there goes the infiltrator bonus. If I could JUST find a way past him undetected then I think I could do this as I could use the smoke cover to strangle the doctor and dump his body and get on the bridge. I guess last resort would be killing the patient by throwing the syringe at him BUT that isn't something I wanna do... civilian death = big point loss. If anyone here is skilled enough to pull of suit only on hard mode well... I'd really appreciate some advice.