A Story from Lori
I once stopped a serious train wreck during the Tchaikovsky 1812, by steady eye contact with conductor (I was playing principal clarinet). The orchestra, duped by the loudness of the trumpets, went with them. But they had rushed ahead. I just kept the place, the conductor and I (he with his silent instrument, lol), louder now, until everyone came back together. For a few scary measures it was mayhem. It just takes one person to hold steady.