How quick would you be to jump into action to save an airplane?

I was on a flight where we landed at DFW and as we were taxiing, some hipster ran to the front of the plane and tried to open the door yelling that we had to get off the plane now and it was an emergency. It then started yelling "I'm in love!" and it got taken down by a male flight attendant. I was up front and got to see the whole thing and half considered jumping in to help.

This video has probably been posted already but it got me thinking. I was expecting someone to tackle him. He's got to know it makes people uncomfortable in more ways than one.