India, July 4 -- A 21-year-old Indian-origin man was arrested in Miami after he allegedly attacked a fellow passenger during a Frontier Airlines flight from Philadelphia. The man, identified as Ishaan Sharma of Newark, reportedly assaulted Keanu Evans without provocation soon after takeoff.

Sharma began acting strangely before the attack. He said Sharma was "doing some, like, dark laugh like, 'ha ha ha ha ha'" and made disturbing statements like, "you puny mortal man, if you challenge me, it will result in your death," according to Evans quoted by WSVN Miami.

Alarmed by the behavior, Evans notified flight attendants. "He kept threatening me with death," he said, explaining that he pressed the call button for help.

Evans claimed Sharma ...