He told the court: “It’s my opinion that officers did a really good job obtaining as much information as possible and that all information was passed on to the tactical firearms commander.
“In particular, PC Bishop’s efforts to allay her fears and gather information were all a very good piece of work by him.”
He added that using non-lethal force, such as a taser or baton gun, would have risked “not neutralising the threat” officers believed Mr Cottier posed to the public.
Dr Itiel Dror, a cognitive neuroscientist hired by the Independent Office of Police Conduct, also testified on whether the second officer was right to fire after Mr Cottier had already been shot.