An air ambulance helicopter pilot approaching to land at an automobile accident site reported a NMAC with a fixed wing aircraft.

Narrative

We are an operator in an Aircraft X based out of ZZZ. We received a dispatch to a scene response just south east of ZZZ1; for an occupant of a motor vehicle which was entrapped. Weather is clear. During our reconnaissance portion of our landing zone which was right next to this crashed vehicle; we had to abort our recon due to an aircraft continuing at us; same height; and not visible to the eye due to its size and color (light white/cream) light green tail number hardly visible. We turned south east away from our landing zone to ensure we avoided the hazard. Once the aircraft was clear we made our approach into the wind traveling north west; at 230 ft. off the ground and in proximity to ground hazards; our ADS-B alarmed traffic again 300 ft. above; the Aircraft Y had made a circle back to the scene a second time and was well within a quarter mile.We were close enough I immediately stopped all forward movement of my helicopter and held an out of ground hover till the completely unaware pilot passed. We believe the pilot was task saturated; flying low; and hyper focused on looking at all the lights and sirens on the ground and was completely unaware of a helicopter trying to conduct life saving operations. This pilot gained the attention of the Highway Patrol; and we reported this incident to our management and through the use of a message system. We believe this aircraft was a power line patrol; and was in close proximity to the power lines; however at a much lower altitude and circling several times for no other reason than to gawk at the site; putting my aircraft my crew and the crews on the ground in grave danger for having a secondary aircraft on aircraft incident; while extricating trapped occupants from a vehicle. This pilot; not once but twice deliberately interfered with our operation and put a lot of lives on the line for simply wanting to take a look.I am a firm believer that people just make mistakes; however this is something more; and this pilot needs a good talk with someone who isn't me; and can explain to them how grave this mistake could have been. I feel there is a chance for this individual to take a step back and remember we are not immune from accidents; and every flight isn't a normal everyday thing. It needs to be taken with utmost seriousness every time you climb in and out of a cockpit. Every time you do something new or not normal you're taking grave risks; like leaving your designated flight path for a look at something. Highway Patrol and local law enforcement reported the aircraft to ZZZ Approach; to tell the [expletive] to wave off and leave the area; I am unsure as to whether that was effective in getting this pilot to leave the area or not.