Can a muggle use a wand? According to CBR.com, Muggles actually can use a wand — they just can't master it. "In fact, at various points — such as in the footnotes of The Tales of Beedle the Bard, a collection of in-universe folk tales — it has been suggested that Muggles could use a wand as a weapon, even if they could never master it," Brandon Zachary wrote for the site. "In the Harry Potter universe, wands are an innately magical tool, capable of rebelling against their user or switching loyalties (such as the Elder Wand). A Muggle gaining one wouldn't just effectively have a stick in their hand but could produce an uncontrollable magical effect."
Zachary added, "Muggles can't necessarily perform magic, but with a wand, they could cause some to manifest in an uncontrollable manner." That could also explain the magic it looked like Jacob was performing in the trailer.
