Controlling an activated sprinkler head can be challenging sometimes. It’s not always as easy, as just putting a wedge in it or shutting a valve. So until you can control by the above means, try using a 2.5″ or 3″ to redirect water to the outside. It will require at-least two firefighters to rotate out. It gets tiring/hard to hold hose up more than a couple of minutes. Just a nugget on salvage operations. Video below.