Not directed at the OP, but can anyone link to some examples of HEMS fatalities (infant gets sucked into intake, patient walks into tail rotor, bystander succumbs to burns from licking hot exhaust, family member decapitated by main rotor) due to hot loading? Ever? Like in 40 years ever? I know there's been a lot of hand wringing through the years over on the medical flightweb, and I'm not claiming that it's never happened, but I'm not aware of any examples. Certainly not enough to discourage this very common practice.
Despite someone's claimed statistical percentages, it defies reason that it could somehow be any faster (just as fast....maybe) to shutdown, load, and restart than just load and go, but then I've not flown an HEMS Astar (thank you baby jesus). Maybe the space-time continuum is upended due to the rotation of the french main rotor?
I never shut down on a highway (or mountain top, for that matter). In fact, we'll occasionally stay airborne if they're not ready for us, depending on the circumstances. We only shutdown for wind chill issues, the rare need for fuel conservation, or to comply with a crew request. Standard practice for scenes is a hot load. The assumption is that they wouldn't have called for a helicopter if the patient wasn't in a hurry. We should at least play our part in this broken system and move them quickly, safely, and efficiently.
I'm not going to tell anyone how to operate their aircraft, knock yourself out and shut down if you like. But please stop spreading disinformation regarding the supposed danger of this time tested, routine, and efficient practice.