Lets say they did think it was an ice pick or pen knife, do you think they thought he was going to leap up and kill them with it. Is it more likely that since they are the po po they refused to back away from someone in a wheel chair. Tell us what you would have done please.
Can't say I wasn't there but did you read the article. It says:
"It was close quarters in the area of the house," Silva said. "The officer was forced into an area where he had no way to get out."
Can't back away when your back is against the wall and the only way out is though someone who MAY have a weapon. Granted you should never put yourself in a position where you don't have a tactical advantage. But no one can control every situation, everyday, 24/7.