Bronx,
I don't call VMC on top a high workload situation.
Single pilot, trying to make it to a heliport,possibly in and out of clouds ,over a large metropolitan city riddled with cranes,changing decisions based on client input,talking to ATC.If that is not a high workload situation I don't know what is.
The myth of multitasking? 
Helicopter pilots have been multitasking since before they invented the word.
Okay so I got your age wrong.However, you do need to read a few more books on human factors and the like before you come out here and make a statement like that. Maybe then you can explain better to your grand kids why it is not safe to text and drive or even talk on the cell phone while doing so.
I know
why he did the things he did.But, you go ahead and try and find someone else to blame.
Alt3.