As for the R22 pilot, leaving the blades at 12/6 is simply stupid, especially if he's about to start up. If you're shut down in 20 kt winds, you really need to think about where the blades are and what might happen in case of a gust, whether natural or from another helicopter.
As for the Gazelle pilot, if you can see that another ship is shut down and the blades are untied, you need to use more care than usual. That's pretty easy to see if the blades are perpendicular to the fuselage, but can be difficult if they're exactly parallel. I've done a number of approaches to offshore platforms where a 206 was shut down, and the blades appeared to be tied, but on low approach turned out not to be, necessitating a go-around at the last second, something I don't appreciate all that much. If you're flying a helicopter with a teetering rotor system, tie the damn thing down when you shut down, or else you will inevitably have some damage sometime.