I asked a friend to take a tour of the Inglewood area near Lolita's Lounge and the 9th Ave corner where Shannon would have emerged from the train bridge underpass. As she approached 9th Ave she would have been near the Ironwoood (1229 9AVE SE), which is a high end (Porsche, formal dress) spot at this time of year. Walking East towards Lolita's, Shannon might have seen someone riding a bike in the -1C temperature, perhaps a pale skinny single woman looking for a meth fix passed her on the street, perhaps two men heading for Lolita's Lounge smelling heavily of cologne got out of a car down the street, maybe four men on the North side of the street were drunkenly hailing a cab. As she walked the poorly lit street towards Lolita's Lounge, which is next to Burglar's Pub (one of two pubs between the intersection near the Ironwood and Lolita's Lounge), she would have crossed one street and passed many narrow passageways between buildings. Between most buildings are 4-5 feet wide people alleys, mostly without gates. It would be very easy for someone to stand in those
alcove-type areas, grab her, and she would disappear. Another method for abducting women was described by 17 year old child murderer Austin Sigg:
He saw 10 year old Jessica Ridgeway walking down the street somewhere in Colorado, so he pulled up on the wrong side of the street ahead of where she was walking. He stopped, got out of the car, opened the rear door as she was walking by, grabbed her, put her in his car, restrained her, showed her a weapon and now she is deceased ... something like this could also happen on 9 Ave SE at 12:30-1AM on Nov 26, 2014 at night in Calgary. 9th Avenue has one driving lane, and one parking lane on both sides of the street. It's not out of the question that someone could pull ahead of her, grab her, and be long gone towards the city limits East of Calgary.
"... he [Austin Sigg] described abducting her [Jessica Ridgeway]as she walked past his car. According to police, Sigg bound her legs and arms, drove around for a while and then took her to his house where he strangled her and dismembered her body in the bathtub."
http://www.huffingtonpost.com/2013/11/19/austin-sigg-sentence_n_4304065.html
Are Shannon's mitts at home? No one would walk from her Townhouse to the Inglewood Pub district without mitts in -1C weather ... mitts and toque weather, but otherwise a good walking temperature.
I would prefer that her husband is responsible, as that means the rest of Calgary is safe. If her husband is not responsible for her disappearance, the only alternative (I've ruled out suicide and travels to Vancouver and Toronto) is that an evil person (probably male) grabbed her off the street, and could act again.