If there is anything good to take away from the appalling tragedy in Toronto on Monday, it's the action -- or rather, non-action -- of one heroic patrol cop.
Const. Ken Lam, siren screaming, pulled his cruiser up near the rental van that had just run over more than 20 people, killing 10, in a mile-long rampage down Yonge Street sidewalks.
A man, later identified as Alek Minassian was standing next to it, shouting and holding something in his hand.
Lam got out of his vehicle, realized he couldn't hear the man, went back and shut the siren off.
Sidearm in hand, he cautiously approached Minassian and realized he was shouting "Kill me" and "Shoot me in the head" while repeatedly pointing what turned out to be a cellphone at him and advancing in a threatening manner.
Lam subsequently holstered his gun, pulled out his baton and calmly advanced. At which point Minassian dropped down and surrendered.
As a result, investigators now have a live suspect to interrogate, instead of another corpse.
At a time when police in Canada and elsewhere are (often rightly) accused of using lethal force indiscriminately, Const. Lam showed that intelligence and restraint can work.
This clip from the CBC shows what happened. And what didn't happen.
For more on Minassian's rampage and the aftermath: