The person who filmed the video of a man being forcibly removed from a United Airlines flight over the weekend says security is not to blame for the situation.

"It's clearly the man's fault that security had to drag him off. He was resisting. I don't blame the security guards at all," Tyler Bridges, who captured the moment on his cellphone, told Fox Business on Tuesday.

Bridges did place blame on United Airlines for provoking David Dao, a 69-year-old Vietnamese-American doctor, and escalating the situation.

"I blame United for this situation for getting to the point where the man was arguing with security," Bridges said.

According to Bridges, a manager for United addressed passengers in an "authoritarian" manner and said the flight would not leave unless four people got off the plane. Since no passengers were willing to give up their seats, the airline chose four passengers at random. Dao was the third person picked and was unwilling to leave the plane.

The airline contends Dao was "disruptive and belligerent," not complying when he was first approached to leave. In an e-mail to employees, obtained by CNBC, United CEO Oscar Munoz praised his employees and said established procedures were followed.

Munoz said crew members "were left with no choice but to call Chicago Aviation Security Officers to assist in removing the customer from the flight," Munoz wrote, arguing the passenger "continued to resist — running back onto the aircraft in defiance of both our crew and security officials."