In order to make her niece into the best warrior on the island, Antiope isn’t taking it easy on Diana, as evidenced by her continually swinging that sword.
Diana’s mother, General Antiope, Diana’s aunt, is putting the main protagonist through an intense training regimen.
Rather than highlight Diana’s heroics in Europe during World War I, this Wonder Woman trailer teaser shows the protagonist back home on Themyscira, the mystically island populated entirely by women.
While Diana briefly loses her balance, her shining moment comes when she blocks one of the sword blows with her enchanted bracelets, which unleashes an energy wave that knocks Antiope clean off her feat.