Hockey Night Online: Flagging controversial calls
David Amber and Rob Pizzo debate merits of coach's challenge
Click on the video player above and watch on demand as host David Amber is joined via Skype by Hockey Night in Canada Radio host Rob Pizzo to debate the merits of throwing the challenge flag, as Vancouver head coach John Tortorella wished to in Sunday's 2-1 loss to Dallas.
Hockey Night Online streams live weekdays at 11:30 a.m. ET.