Then immediately turn heat down by half to medium.
The lemon (real - not the reconstituted stuff) goes on right before it is done cooking...does not take long.
I would add that dusting the scallops with a hint of flour helps protect them...and thickens the lemon sauce a bit.
I was taught to keep spooning the hot fat over the top of the scallops. The flour would probably be a good idea, but just making sure they’re perfectly dry would go a long way in the same direction. The recipe doesn’t include any of that stuff, which is a recipe for disaster IMHO.