They're going to be disarmed by the first first-year with an Expelliarmus charm they come across if they keep holding their wands that gingerly.
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We did the wand thing at the UK tour as well -- it's very cute. They have an interactive video with the guy who did all the spellcasting choreography (a choreoanimator of sorts!), and he teaches you five or six different spellcasting techniques. Lots of fun. No Windsors there with us, however.