Rogue-Nation3

Now heres something you dont see everyday .... 3 people killed in crossbow attack in canada ..... makes one wonder how the attacker managed to kill 3 people without getting rushed while reloading the crossbow ..... supposedly the attack related to earlier incident with a package that caused temporary problem at building ..... my guess probably muzzies playing crusades ..... 

canada crossbow attack

I agree, crossbows by my knowledge need to be pulled back usually with two hands after each bolt is fired.
But I did find a Simi Auto Crossbow.

Magazine fed repeating crossbow