Grammy award winner Halsey has had her concert descend into utter chaos with flash flooding and tornado warnings barrelling down on her US gig. The ‘Bad At Love’ singer was scheduled to perform at Merriweather Post Pavilion, an outdoor venue in Columbia, Maryland, before unexpected torrential rain fell from the sky. The amphitheatre proceeded to flood with ankle-deep water, seeing concertgoers trudge through the murky depths. Videos posted online depicted utter chaos as the venue was inundated with water, and the concert was eventually called off for safety reasons. However, floodwaters weren't the only shocking thing all concertgoers got to...