"... detained under the Mental Health Act for admission to a psychiatric unit for further assessment and treatment ...!"
Baggage? Baggage??? Sod the 'extra' bag argument! If I'd been one of the pax on that aircraft and found that out I'd be somewhat relieved he was taken off before departure for whatever reason! Who knows what he might have kicked off about in mid air had he been in that frame of mind? And the fact that he had to be tasered would indicate that it would quite likely have been more than anyone else could cope with!!