The pilots could wedge that helicopter into what seemed like impossibly small places. Of course there are standards for an acceptable landing zone, but that space sometimes looked mighty small. Another factor was weather. We flew by what is known as visual flight rules, rather than by instrument. Therefore we couldn't fly somewhere we couldn't see.
Weather is notoriously unpredictable, and it was the most common reason for aborting flights.
Firefighters on the scene would wet the landing zone down with water to avoid a brown out for us before we landed. From the air it appeared to be a giant wet spot as if some gigantic dog came by to relieve himself. I imagine there are extraordinary nurses in other fields who might take offense. What I do know is that competition to land a job as a flight nurse is pretty brutal. We would only take about out of 15 applicants, and then some would wash out in the training.