I have a citizens arrest & I could have used as much force as necessary to apprehend the perpetrator. So they could of & should of beat the living shit out of Li. Getting help for mental illness is a huge problem in Canada all down the line. I'd be staying awake on the buses from now on, there's always the copy cat killer. Now it would have been nothing had he shot 5-10 people just another shooting spree. A good thing guns weren't involved. Li after searching out the smallest male killed & mutilated a sleeping man. I could never wear headphones, walkmans I like to hear the streets & surroundings. My condolences to the McLean family.