KKR vs LSG: Why was Kartik Tyagi allowed to complete final over after two No Balls?

Kolkata Knight Riders pacer Kartik Tyagi bowled two over-the-waist No Balls in the final over of Lucknow Super Giants' innings. However, he was allowed to continue bowling despite the rules stating that a bowler cannot bowl two beamers in a single over. The umpires concluded that the second full toss was not "dangerous" and away from the batter's body, allowing Tyagi to continue bowling the over.