UPDATE:The attorney I linked earlier posted an
update video about the following.
The Chicago Aviation Police have released an official statement regarding what happened:
"The aviation security officer who pulled the man from his seat was placed on leave Monday, “pending a thorough review of the situation,” the Chicago Department of Aviation said in a statement. “The incident on United Flight 3411 was not in accordance with our standard operating procedure and the actions are obviously not condoned by the department.” "
This apparently makes it a lot easier for the victim to sue. I really, really hope he gets a lawyer if this statement turns out to be accurate.