re: TSA tries to detain passenger for additional screening AFTER completing flight

There is another video from the same dude which appears to be him walking off that same flight that just landed in Denver. He is the only one getting off the plane while everyone else is sitting down. He makes it sound like they asked him to get off first.

He seems to be somewhat irate and makes it known to the passengers. He was making it known to everyone that he thought what they were doing were wrong and he hasn't "committed a crime".

This gives little to no reason that they should need to screen him again, but maybe that is come context as to why they did.