Interesting that the report in the Halifax Herald states that "From the helicopter there were no gouges visible in the pavement, but two tire marks in the brown grass led to a line of orange posts, part of the airport's navigational system."
It further says that "...the tail of the jet bounced twice off the tarmac near the end of the runway and separated from the plane when it hit a mound of earth 300 metres beyond the end of the runway."
The visible tire marks suggest that the plane stayed on the ground for that distance of 300m past the runway threshold.