What a magnanimous reply to someone who deserves no mercy for acting like an absolute snake. By the way, as an indication that Rowling is indeed a writer:
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Most people would use the phrase "change of tact," which means something similar but is not the original phrase nor is it the best fitting. Tacking is a nautical term (a common origin for many turns of phrase) which refers to the ropes used for changing the direction of sails to catch wind. When she says, "change of tack," she means Emma has turned her sails back in Rowling's direction now that the wind has blown her way, which is a subtly different notion to "change of tact," meaning "tactics," which would infer that there was a battle between the two requiring tactics. No, change of tack nicely describes Emma as someone who just goes wherever the wind dictate her, calling her out as a mindless drone
and a fair-weather friend without ever uttering either phrase once.
Truly a masterful flourish and a deft demonstration of the British knack for delivering deep cuts without resorting to vulgarity, but I doubt Ms. Watson has the intellect to detect such a barb. She is a Hollywood golem, after all.