Biff was compelled to look at his watch as reality shifted around him. The watch let out a bright light as it deflected the stone's magic from him. Unfortunately it didn't block everything it just saved Biff, who felt incredibly dizzy.
Everyone at Biff's, no, Buffy's birthday dinner screamed. Biff because they where no longer at the sports grill but instead at a fancy restaurant with everyone else's clothes shifting, Everyone else because from their perspective the birthday girl Buffy Meadows had suddenly become a guy.