Isofluorane is an anesthetic gas, but it is not delivered in canisters as a gas. It is a liquid which must be converted to a gas by a vaporizer unit prior to use as an anesthetic. Additionally, the time of onset once exposed to the gas is nowhere near as fast as depicted.
Cameraman filmed another Cameraman after they show the belly stab wound.
LaSalle says the bomb squad "called an audible" on the gas canisters in that they were not explosives or poisonous gas. The slang term he used refers to making a last-minute change of plans, which was not what had taken place.