Drunk, Ranting Man Bound and Gagged by Airline

"A passenger aboard an Icelandair flight had to be tied down by fellow passengers after going on a rampage Thursday. According to Icelandic media outlet MBL.is, the passenger began acting out two hours before the flight was set to land. He reportedly had been drinking heavily, and allegedly began ranting, spitting and threatening the crew before he was restrained."* What is a flight crew to d ...